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

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

A.
Socket options=port:445

B.
Disable directhosting=No

C.
Smb port = 445

D.
Disable netbios = Yes