While performing activities that are related to controlling project and product scope, a project manager finds scope creep. What is the best way that the manager can use to take corrective action?

The best corrective action that the project manager needs to take is to analyze the impact of the scope change and what options exist (for example: whether to undo what has been completed or analyze whether the scope change should be approved). This should occur through the formal change control process via a change request.