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).