. 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.