Explanation
According to the ServiceNow Hardware Asset Management documentation, the Now Agent Mobile App is a mobile application that enables users to perform various asset management tasks on the go, such as creating assets, performing inventory audits, and receiving assets1. The Now Agent Mobile App provides access to the following features2:
Asset Receiving: Users can receive multiple assets against a purchase order using a mobile device.
Users can scan barcodes or QR codes to identify assets and update their status and location.
Asset Inventory Audit: Users can manage assets across locations with simplified mobile inventory processes. Users can scan barcodes or QR codes to verify assets and update their information. Users can also view audit results and resolve discrepancies.
Asset Creation: Users can create new assets using a mobile device. Users can scan barcodes or QR codes to populate asset fields and assign them to stockrooms or users.
The other options, Now Procurement App, Now Mobile App, and Now Onboarding App, are not related to hardware asset management. The Now Procurement App is a mobile application that enables users to manage purchase orders, requisitions, and contracts3. The Now Mobile App is a mobile application that enables users to access ServiceNow services and information, such as requesting items, viewing incidents, and checking assigned assets. The Now Onboarding App is a mobile application that enables users to complete onboarding tasks, such as signing documents, enrolling in benefits, and setting up devices. References:
ServiceNow Hardware Asset Management: Now Agent Mobile App
ServiceNow Hardware Asset Management: Mobile Asset Management
ServiceNow Hardware Asset Management: Now Procurement App
[ServiceNow Hardware Asset Management: Now Mobile App]
[ServiceNow Hardware Asset Management: Now Onboarding App]

Explanation
According to the ServiceNow Hardware Asset Management documentation, a swap/replace asset task is a type of asset task that is used to replace a faulty or damaged asset with a new or refurbished one1. When an incident is resolved by swapping or replacing an asset, the Incident Management application triggers a swap/replace asset task and assigns it to the asset manager2. When the asset manager completes the task, the following fields are automatically updated in the associated asset record3:
Software allocations: The software allocations of the old asset are transferred to the new asset, and the old asset is marked as unallocated.
Related CI record: The related configuration item (CI) record of the old asset is updated with the new asset information, and the old asset is marked as retired.
Disposal information: The disposal information of the old asset is updated with the reason, date, and method of disposal.
The other options, maintenance contracts and depreciation values, are not automatically updated in the associated asset record when a swap/replace asset task is triggered. Maintenance contracts are not affected by the swap/replace operation, as they are linked to the asset model, not the individual asset4. Depreciation values are not updated automatically, as they are calculated based on the asset cost, depreciation method, and depreciation schedule5. References:
ServiceNow Hardware Asset Management: Asset tasks
ServiceNow Hardware Asset Management: Swap/replace asset task
ServiceNow Hardware Asset Management: Swap/replace asset task workflow
ServiceNow Hardware Asset Management: Contract and renewal management
ServiceNow Hardware Asset Management: Depreciation

Explanation
According to the ServiceNow Hardware Asset Management documentation, a contract is a record of the terms and conditions that govern the relationship between a vendor and an organization. A contract can have different states that indicate its status and lifecycle. The states are:
Draft: The contract is being created or modified and has not been submitted for approval.
Requested: The contract has been submitted for approval but has not been approved yet.
Active: The contract has been approved and is in effect. You can cancel the contract in this state, if you want to terminate it before its end date due to various reasons, such as breach of contract, mutual agreement, or vendor performance1.
Expired: The contract has reached its end date and is no longer valid. You cannot cancel the contract in this state, but you can renew it or extend it.
Renewed: The contract has been renewed for another term with the same or modified terms and conditions. You cannot cancel the contract in this state, but you can renew it or extend it again.
Extended: The contract has been extended beyond its original end date with the same terms and conditions. You cannot cancel the contract in this state, but you can renew it or cancel it.
Canceled: The contract has been terminated before its end date. You cannot cancel the contract in this state, but you can reactivate it or delete it.
Rejected: The contract has been rejected by the approver. You cannot cancel the contract in this state, but you can edit it or delete it.
References:
ServiceNow Hardware Asset Management: Contract and renewal management
ServiceNow Hardware Asset Management: Contract states

Explanation
A stock rule is a record that defines the minimum and maximum quantity of a model or an asset in a stockroom12.
The Stock Rule Runner is a scheduled job that runs every hour and checks the stock levels of models and assets in stockrooms against the stock rules13.
If the stock level of a model or an asset is less than the minimum quantity specified in the stock rule, the Stock Rule Runner creates a stock order to replenish the stock from another stockroom or from a vendor13.
Therefore, the correct answer is A. When stock is less than the threshold specified in the stock rule.
References: 1: Use a hardware asset request flow - ServiceNow 2: Hardware Asset Inventory Management - ServiceNow 3: Stock Rules in ServiceNow - GlideFast ServiceNow

Explanation
Operational expenses are the costs incurred by an organization to maintain and use an asset throughout its lifecycle. These costs include the expenses related to the repair, maintenance, upgrade, and disposal of the asset. Some examples of operational expenses are:
Replacement parts: These are the costs of purchasing and installing new parts or components for an asset that is damaged, worn out, or obsolete. For example, replacing a hard drive, a battery, or a keyboard for a laptop.
Maintenance agreements: These are the costs of contracting with a vendor or a service provider to perform regular or preventive maintenance on an asset. For example, paying a monthly fee for a technician to check and service a printer or a scanner.
Other examples of operational expenses are:
Storage costs: These are the costs of renting or owning a space to store an asset that is not in use or awaiting disposal. For example, paying for a warehouse, a locker, or a shelf to keep unused or surplus computers or monitors.
Warranty costs: These are the costs of extending or renewing the warranty coverage for an asset that is still under the manufacturer's warranty or has expired. For example, paying an extra fee for a one-year or a three-year warranty extension for a tablet or a smartphone.
References:
Hardware Asset Management overview, which describes the functionalities of the Hardware Asset Management application, including the dashboard, model normalization, hardware refresh, lease contract expiration, disposal orders, and RMA requests.
Hardware Asset Management, which gives an overview of the benefits and features of the Hardware Asset Management solution, such as reducing costs, improving compliance, optimizing asset utilization, and enhancing service delivery.
Hardware Asset Management - ServiceNow, which provides a data sheet with the key capabilities and benefits of the Hardware Asset Management application.