What does the Server Message Block (SMB) protocol enable?

What does the Server Message Block (SMB) protocol enable?

A.
Linux client access to files and printers hosted on a Mac OS X server.

B.
Windows client access to files and printers hosted on a UNIX server.

C.
Novell client access to files and printers hosted on a Windows NT server.

D.
Mac OS X client access to files and printers hosted on a NetWare server.