You are the administrator of an organization with a single Active Directory domain. One of your senior executives tries to log onto a machine and receives the error "This user account has expired. Ask your administrator to reactivate your account." You need to make sure that this doesn’t happen again to this user. What do you do?

C) modify the user's properties to set the Account Never Expires setting

Explanation:

Based on the scenario being described it can be said that in order to completely make sure that his does not happen again you need to modify the user's properties to set the Account Never Expires setting. Doing so will prevent the executives account from expiring and having to reactivate the account again every time this would otherwise happen.