Final answer:
Account expiration is the term used to indicate when an account is no longer active, which helps manage orphaned and dormant accounts by automatically disabling them after a set period of inactivity.
Step-by-step explanation:
To assist with controlling orphaned and dormant accounts, account expiration can be used to indicate when an account is no longer active. This is a feature in many account management systems that automatically disables an account after a certain period of inactivity. Setting an expiration policy ensures that accounts are not left open indefinitely, which can pose a security risk.
Last login and account last used data can also help administrators determine if an account has been inactive and take appropriate measures. However, these methods are more reactive, as they require someone to monitor and then manually deactivate the accounts. Using account expiration is a more proactive approach to managing the lifecycle of user accounts.