Which Salesforce feature can be used to require updates to case status after a solution has been sent?

The correct response involves the use of workflow rules, which are designed to automate standard internal procedures and processes. In the context of Salesforce, workflow rules can trigger actions based on specific criteria being met. When a solution is sent to a customer, a workflow rule can be set up to automatically require that the case status is updated to reflect the new stage of the process. This enforcement ensures that all cases are accurately tracked and managed effectively.

Workflow rules allow for the definition of precise criteria for when an update should occur, and the associated actions can include sending notifications, updating field values—such as the case status, in this scenario—or even assigning tasks to team members to ensure follow-up. This level of automation helps streamline case management and encourages consistency in how cases are handled after a solution has been communicated to a customer.

Other options, such as assignment rules, validation rules, and auto-response rules, serve different purposes. Assignment rules are specifically for directing cases to the appropriate queue or user. Validation rules ensure data integrity by enforcing rules on user inputs, while auto-response rules are used to send automatic email responses when a case is created. Therefore, workflow rules are the most appropriate feature for the requirement of case status updates after a solution has been sent.