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?

While `disable netbios = yes` would prevent Samba from using port 139, it also disables all NetBIOS name resolution services, which is a broader impact than simply controlling the listening ports.

The `smb port` parameter explicitly configures Samba to listen only on the specified port(s). Setting `smb port = 445` causes Samba to only accept connections on TCP port 445, effectively stopping the use of TCP port 139 for NetBIOS sessions.

`disable directhosting = No` would enable SMB over TCP/IP (port 445) but does not inherently stop the use of port 139 unless other port configurations are also made.

`socket options` is used for configuring various TCP socket-level behaviors and does not specify which ports Samba should listen on; the syntax `port:445` is incorrect for this parameter.