A company plans to deploy Windows 8.1 to 100 client computers. Each client computer has 8 GB of memory.
You have the following requirements:
Ensure that the operating system fully utilizes the available memory.
Ensure that the operating system can be activated by using a Key Management Service (KMS) client setup key.
Minimize the operating system space requirements.
You need to identify the appropriate edition of Windows 8.1 to install on the client computers. Which edition
should you install?

A.
Windows 8.1 Pro 64-bit

B.
Windows 8.1 Pro 32-bit

C.
Windows 8.1 Enterprise 32-bit

D.
Windows 8.1 Enterprise 64-bit

E.
Windows 8.1 64-bit

F.
Windows 8.1 32-bit

Explanation:
http://msdn.microsoft.com/enus/library/windows/desktop/aa366778%28v=vs.85%29.aspx#physical_memory_limits_windows_8