Which of the following fstab entries will mount a Samba share at boot time?

A.
//servername/sharename /mountdirectory smbfs
username=windowsusername,password=windowspassword 0 0

B.
//servername/sharename /mountdirectory sambafs
username=windowsusername,password=windowspassword
0 0

C.
servername:sharename /mountdirectory smbfs
username=windowsusername,password=windowspassword 0 0

D.
smbmount //servername/sharename /mountdirectory -o
username=windowsusername,password=windowspassword