Your company has a single Active Directory directory service domain. All servers in your environment run Windows Server 2003. You have a stand-alone server that serves as a Stand-alone root certification authority （CA）. You need to ensure that a specific user can back up the CA and configure the audit parameters on the CA.  What should you do？（）

A、 Assign the user account to the CA Admin role.

B、 Add the user account to the local Administrators group.

C、 Grant the user the Back up files and directories user right.

D、 Grant the user the Manage auditing and security log user right.