what parameter is required in smb.conf in Samba 3?

In order to restrict access to the SMB (445/tcp) port and stop the use of NetBIOS (139/tcp), what parameter is required in smb.conf in Samba 3?

A.
disable netbios = Yes

B.
smb port = 445

C.
disable directhosting = No

D.
socket options = port:445