Automatic restocking actions are actions that are triggered by a scheduled job when the stock level of a hardware asset model falls below the minimum threshold defined in the stock rule1.
Automatic restocking actions can help to maintain the optimal inventory level and avoid stock shortages or overstocking1.
The baseline system provides two automatic restocking actions out of the box1:
Create a task assigned to stock room manager to contact procurement manager: This action creates a task record in the Hardware Asset Management application and assigns it to the stock room manager of the source stockroom. The task instructs the stock room manager to contact the procurement manager to initiate the purchase order process for the asset model that needs to be restocked1.
Create a transfer order to restock from another stockroom: This action creates a transfer order record in the Hardware Asset Management application and assigns it to the stock room manager of the source stockroom. The transfer order contains the details of the asset model, quantity, source stockroom, destination stockroom, and expected delivery date that need to be moved between the stockrooms1.
The other options are not available as automatic restocking actions in the baseline system, but they can be customized or added as additional actions if needed1. References:
Automatic restocking actions

Explanation
Normalization is the process of restructuring data to maintain consistency, accuracy, and completeness across different sources and systems. Normalization helps to eliminate data duplication, conflicts, and errors, and to ensure that the data conforms to predefined standards and rules. Normalization is especially important for hardware asset management, as it enables users to have a clear and unified view of their hardware models, manufacturers, product names, device types, and other attributes. ServiceNow Hardware Asset Management provides a feature called Hardware Model Normalization, which allows users to normalize the details of their hardware and consumable models using predefined or custom rules, data sources, and schedules. Hardware Model Normalization can be accessed from the Hardware Asset Management application menu in the ServiceNow platform1. References: Hardware Asset Management - ServiceNow, Hardware Asset Management - Product Documentation: Tokyo -ServiceNow, Hardware Asset Management Implement - Customer Success - ServiceNow, Work with hardware normalization - ServiceNow - Now Support, Getting Started with ServiceNow Hardware Asset Management

Hardware model normalization is a feature that enables users to normalize the details, such as manufacturer, product, model, and device type, of their hardware and consumable models1.
Hardware model normalization uses the data from the Hardware Model Normalization Content Service, which is a cloud-based service that provides standardized information for thousands of hardware models1.
The key attribute in the model record that hardware model normalization uses to normalize inconsistent manufacturers and product names is the model number12.
The model number is a unique identifier for a specific product or model that is assigned by the manufacturer12. It is based on the United Nations Standard Products and Services Code (UNSPSC), which is a global classification system for products and services23.
Hardware model normalization compares the model number of the model record with the model number of the Hardware Model Normalization Content Service record and updates the model record with the normalized information, such as display name, manufacturer, product, and device type12.
The other options are not the key attribute that hardware model normalization uses to normalize inconsistent manufacturers and product names. The asset tag, the display name, the model category, and the asset tracking unit are either not unique or not based on the UNSPSC.
Reference:
1: Hardware Model Normalization - Product Documentation: Tokyo - ServiceNow
2: Hardware Asset Management overview - ServiceNow - Now Support
3: Product Documentation | ServiceNow
4: Automation Simplifies Hardware Asset Management - ServiceNow Blog