What action should be taken if a user account needs to be temporarily disabled?

Disabling a user account is a crucial action that should be taken when an account needs to be temporarily suspended. The method to do this in an Active Directory environment is specifically through the command to disable the account, which is represented in the option that was identified as correct.

The command associated with this action directly targets the account's status without completely removing it from the system, allowing for an easy reactivation later. This is particularly useful in scenarios where a user may be on leave or needs a break from access without the need for a complete account deletion and re-creation.

The other options involve actions that do not serve the purpose of temporarily disabling an account. For instance, removing a user would permanently eliminate the account, while modifying or setting a user might change certain attributes (like permissions or group memberships) but wouldn’t specifically disable the user account. Hence, the choice to disable an account is both practical and efficient for management of user access.