Your network consists of a single Active Directory domain. All servers run Windows Server 2003 Service Pack 2 (SP2). You create a new domain user account named User1 and assign the account a password of P@ssw0rd. On the new account, you enable the User must change password at next logon option. A week later, you discover that User1 is still using the password P@ssw0rd to log on to the domain. You need to ensure that User1 is forced to use a different password the next time she changes her password. What should you do first? （）

A. In the Default Domain Policy, select Enforce password history.
B. In the Default Domain Policy, select Passwords must meet complexity requirements.
C. From the User’s account properties, select Account is sensitive and cannot be delegated.
D. From the User’s account properties, select Store password using reversible encryption.