A business user wants a quick way to edit a record's status and enter a custom due date field from the record's feed in Salesforce Mobile App. What…

A custom action, specifically an "Update a Record" quick action, is the designated tool for this requirement. Administrators can create an object-specific action that allows users to modify specific fields, such as 'Status' and a custom 'Due Date'. This action can then be added to the object's page layout. When accessed from the record's feed or the action bar in the Salesforce Mobile App, it presents a compact, focused interface for users to quickly make their edits without navigating to the full record edit page. This directly addresses the user's need for a quick way to edit specific fields from the feed.

B. Custom button: Custom buttons are generally used for linking to URLs, Visualforce pages, or executing JavaScript (in Classic), not for providing a streamlined field-editing interface in the mobile feed.

C. Custom quick access link: This is not a standard Salesforce feature. "Custom Links" exist on the Home Page or in list views but are not designed for record-specific editing from the feed.

D. Custom URL formula Field: A formula field generates a clickable link on the record detail page. It cannot create an interface to edit other fields on the same record directly from the feed.

1. Salesforce Help - Quick Actions: "Quick actions let users do more in Salesforce and in the Salesforce mobile app. With custom quick actions, you can make your users’ navigation and workflow as smooth as possible by giving them convenient access to information that’s most important... For example, you can let users create or update records..." This source confirms that Quick Actions are the intended feature for updating records efficiently.

2. Salesforce Help - Create Object-Specific Quick Actions: "Create object-specific actions to give users the ability to create or update records... in the context of a particular object... For example, add an action to the Account object that creates a contact. If a user creates a contact from the detail page for the Acme account, that new contact is automatically associated with Acme." This document details the creation process for actions like the one required.

3. Salesforce Help - Action Layouts: "For create a record, log a call, and custom actions, the action layout determines the fields that are displayed to users. For update a record actions, the action layout also lets you specify which fields can be edited." This confirms that an "Update a Record" action layout can be customized to show only the 'Status' and 'Due Date' fields.

4. Salesforce Help - Actions in the Salesforce Mobile App: "Actions appear in the action bar, its action menu, and as list-item actions. They can also appear on a record’s related information page... The actions that are available depend on the page the user is viewing." This source verifies that custom actions are a primary component of the mobile user interface.