Which of the servers can be upgraded directly to Windows Server 2012 without the need to purchase new hardware or install additional service packs?

You work as a Network Administrator at ABC.com. The network contains a single Active Directory
Domain Services (AD DS) domain named ABC.com.
The network includes servers running various versions of Windows Server 2008. You plan to
upgrade all servers in the network to Windows Server 2012.
Some servers run the 32-bit version of Windows Server 2008 Service Pack 2 (SP2) on hardware
with x86 CPUs.
Some servers run the 64-bit version of Windows Server 2008 Service Pack 2 (SP2) on hardware
with x64 CPUs.
Some servers run Windows Server 2008 R2 on hardware with x64 CPUs.
Some servers run Windows Server 2008 R2 Service Pack 1 (SP1) on hardware with x64 CPUs.

Which of the servers can be upgraded directly to Windows Server 2012 without the need to
purchase new hardware or install additional service packs? (Choose all that apply)

A.
The servers running the 32-bit version of Windows Server 2008 Service Pack 2 (SP2) on
hardware with x86 CPUs.

B.
The servers running the 64-bit version of Windows Server 2008 Service Pack 2 (SP2) on
hardware with x64 CPUs.

C.
The servers running Windows Server 2008 R2 on hardware with x64 CPUs.

D.
The servers running Windows Server 2008 R2 SP1 on hardware with x64 CPUs.