Your network consists of a single Active Directory domain named Contoso.com. All servers on the network run Windows Server 2003 Service Pack 2 （SP2）.  All client computers on the network run Windows XP Professional Service Pack 3 （SP3）. All computers run a custom application named App1. App1 requires domain authentication. App1 does not support smart card authentication.Your company implements a new security policy that states that all users must log on to their computers by using a smart card.You need to ensure that all users can use App1 while meeting the new security policy.  What should you do？（）

• A、Configure the Smart Card service to start automatically on all computers by using a Group Policy object （GPO）.
• B、From the properties of all user accounts， enable the Store password using reversible encryption setting.
• C、From the properties of all user accounts， enable the Require smart cards for interactive logon setting.
• D、Enable the Require smart cards for interactive logon policy setting on all computers by using a Group Policy object （GPO）.