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).

Explanation:

http://technet.microsoft.com/en-us/library/cc731589.aspx
To apply PSOs to users or global security groups using the Windows interface
1. Open Active Directory Users and Computers
2. On the View menu, ensure that Advanced Features is checked.
3. In the console tree, click Password Settings Container.
4. In the details pane, right-click the PSO, and then click Properties.
5. Click the Attribute Editor tab.
6. Select the msDS-PsoAppliesTo attribute, and then click Edit.
7. In the Multi-valued String Editor dialog box, enter the Distinguished Name (also known as
DN) of the user or the global security group that you want to apply this PSO to, click Add,
and then click OK.