After installing a network with one Samba server and several clients， users are complaining that they receive an Unable to browse the network error when trying to visit a public share. What is the most likely cause of this？ （）

• A、 The user entered the wrong username and/or password.
• B、 The nmbd process is not running on the Samba server.
• C、 The user hasn’t mapped the share to a local drive letter yet.
• D、 The Samba server is not configured as a Domain Master Browser.