Which operating systems are supported by a Check Point Security Gateway on an open server?

Which operating systems are supported by a Check Point Security Gateway on an open server?
Select MOST complete list.

A.
Sun Solaris, Red Hat Enterprise Linux, Check Point SecurePlatform, IPSO, Microsoft Windows
B. Check Point GAiA and SecurePlatform, and Microsoft Windows

C.
Check Point GAiA, Microsoft Windows, Red Hat Enterprise Linux, Sun Solaris, IPSO

D.
Check Point GAiA and SecurePlatform, IPSO, Sun Solaris, Microsoft Windows