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?

A.
Check Point SecurePlatform and Microsoft Windows

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

C.
Check Point SecurePlatform, IPSO, Sun Solaris, Microsoft Windows

D.
Microsoft Windows, Red Hat Enterprise Linux, Sun Solaris, IPSO