Explanation
The following statements about Action Plans are true:
When you work with Action Plans, you first create Action Plan Templates, which are reusable sets of tasks that define a common client process1.
Action Plans make it easy to create reports and dashboards, so you can monitor progress and ensure compliance. Users can use standard report types or custom report types to create reports on action plans, action plan templates, action plan items, action plan item templates, and action plan item owners1.
Action Plans can be used to automatically assign task owners and deadlines for specific client engagements. Users can specify task owners by using assignment logic such as specific user, role, queue, action plan creator, or account team1. Verified References: 1

Explanation
To integrate with an external system, Salesforce needs to have objects and fields that can store the data that will be sent from the external system via an API. These objects and fields should match the data structure and format of the external system as much as possible. Additionally, Salesforce needs to have an integration user and an integration profile that can enable the connection between Salesforce and the external system. The integration user is a dedicated user account that has access to the API and can perform data operations on behalf of other users. The integration profile is a custom profile that defines the permissions and settings for the integration user.

Explanation
Again, Action Plans are a feature that can help users track and manage common client processes. For a commercial loan due diligence process, users can create an Action Plan Template with tasks such as verifying income, checking credit history, appraising collateral, etc. Users can also assign different task owners and deadlines for each task to distribute the work and monitor the progress. Users can also use dashboards and reports to view the % completion of the due diligence process per client and report on the performance of the department to show possible bottlenecks.