You create a Password Settings object （PSO）.   You need to apply the PSO to a domain user named User1.     What should you do（）

• A、Modify the properties of the PSO.
• B、Modify the account options of the User1 account.
• C、Modify the security settings of the User1 account.
• D、Modify the password policy of the Default Domain Policy Group Policy object （GPO）.