According to Microsoft SC-300: Identity and Access Administrator Study Guide and Microsoft Learn - Manage access reviews in Azure AD Identity Governance, administrators can configure access reviews for users who have access to specific applications. Access reviews are ideal when you need to regularly validate user access and automatically remove inactive or unnecessary accounts, including guest users.
For guest access to applications like App1, Azure AD allows you to configure an access review for application access with recurrence (for example, every 30 days). In the review settings, you can enable the option "Automatically remove access for users who do not respond" or "Remove access if user has not signed in within 30 days." This automation fulfills the requirement to remove access for guest users who haven't used the app in 30 days while minimizing administrative effort-no manual intervention needed.
# Correct Answer: B. an access review for application access