What operating systems are sufficient for an installation for a license server?

What operating systems are sufficient for an installation for a license server? Select three

A.
Microsoft Windows 2003

B.
Microsoft XP Home Edition

C.
Windows XP Professional Service Pack 2

D.
Microsoft Windows 2000 Server Service Pack 4

E.
Microsoft Windows 98

F.
Microsoft Windows Vista

Explanation:
License Server Software Requirements
The license server software is supported on the 32-bit versions of the following operating systems:
Windows 2000 Server SP4
Windows XP Pro (at any SP level)
Windows 2003 (all releases except 64 bit)