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 whilemeeting 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）.