You need to provide user accounts for the employees of the newly acquired company

Your network consists of one Active Directory domain that contains only domain controllers that run Windows Server 2003. Your company acquires another company.

You need to provide user accounts for the employees of the newly acquired company. The solution must support multiple account lockout policies.

What should you do?

A.
Implement Authorization Manager.

B.
Implement Active Directory Federation Services (AD FS).

C.
Upgrade one domain controller to Windows Server 2008. Raise the functional level of the domain to Windows Server 2003.

D.
Upgrade all domain controllers to Windows Server 2008. Raise the functional level of the domain to Windows Server 2008.