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The correct answer is B. Use field-level security on page layouts with record types to restrict editing fields.
The requirement changes after the Opportunity is closed. The best configuration is to use record types with assigned page layouts so the closed Opportunity layout can make most fields read-only while allowing the Sales Operations team to edit the two post-close fields. Salesforce page layouts can control which fields are visible, read-only, or required, and page layouts can be assigned by profile and record type.
A is incomplete because it does not account for different behavior after close. C is incorrect because field sets are not used for page-layout field editability. D is too broad because it would make fields read-only for the Sales profile regardless of Opportunity stage.

The correct answer is B. Custom action.
The user wants to edit a record's Status and enter a custom Due Date quickly from the record feed in the Salesforce mobile app. A custom action, specifically an object-specific quick action, can expose selected fields for fast updates on mobile. Salesforce documentation states that object-specific actions let users quickly create or update records in the context of a specific record, and the Salesforce mobile action bar displays actions in mobile places such as feeds and record pages.
Custom button and URL formula field are not the best mobile feed-editing tools. Custom quick access link is not the correct Salesforce feature for this requirement.

The correct answers are C. Email Alert, D. Task, and E. Outbound Message.
In a standard Salesforce approval process, available approval action types include Email Alerts, Tasks, Field Updates, and Outbound Messages. Since Field Update is not listed in the answer choices, the three valid action types from the options are Email Alert, Task, and Outbound Message. Salesforce documentation identifies approval-process actions around task, email alert, field update, and outbound message automation.
A . Invocable Flow is incorrect because it is not a standard approval-process action type in this exam context.
B . Decision Element is incorrect because Decision is a Flow element, not an approval-process action.

The correct answers are A. Navigation Menu and C. In-App Notification.
Salesforce documentation states that users can receive and act on approval requests in the Salesforce mobile app by tapping the notification or by going to Approval Requests in the navigation menu. Salesforce also describes the Approval Requests navigation item as showing pending approvals where users can approve or reject items from within Salesforce.
Why others are incorrect:
B . Home Screen is not the documented approval-response delivery method in this context.
D . Record Detail is not the best answer here because the documented mobile approval response paths are the notification and the Approval Requests navigation item.