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.