When a sales rep needs to give an additional discount for an opportunity, a manager needs to review and authorize the discount request. What should be used to lock the record before a decision is made

A Page Layout controls which fields and related lists are displayed on a record - it has no ability to route a record for review or lock it.

A Validation Rule enforces data integrity by preventing saves when criteria are not met, but it cannot route a record to a manager or lock it.

A Workflow Rule can trigger automated actions like field updates or emails, but it does not support multi-step approval routing, manager authorization, or record locking.

An Approval Process allows an administrator to define a sequence of steps that a record must go through for authorization, including locking the record so it cannot be edited while pending review. It supports automatic submission, approval/rejection actions, and email notifications to the appropriate approvers.