What is the benefit of using 'terraform plan -out'?

Using 'terraform plan -out' allows users to save the execution plan to a file for applying later. This is a significant benefit because it enables teams to review the proposed changes to the infrastructure before they are implemented, ensuring that everything aligns with expectations and prevents any unintended alterations. By creating a saved plan file, users can share it with team members for approval, conduct further analysis, or even apply it at a later time without needing to regenerate the plan. This enhances collaboration and review processes, promoting a more controlled and structured approach to infrastructure management.

In this context, the other choices do not accurately capture the purpose of the 'terraform plan -out' command. Immediate resource destruction and optimizing resource allocation are not functions of the 'plan' command. Additionally, generating an interactive user interface is outside the scope of what 'terraform plan' achieves, as it primarily focuses on plan generation and not user interaction in a graphical sense.