Which operating system(s) support(s) unnumbered VPN Tunnel Interfaces (VTIs) for route-based VPNs?

Which operating system(s) support(s) unnumbered VPN Tunnel Interfaces (VTIs) for route-based VPNs?

A.
Red Hat Linux

B.
SecurePlatform for NCjX and higher

C.
Solaris 9 and higher

D.
IPSO 3.9 and higher