$ sudo mount -t cifs //w.x.y.z/Home$ /mnt/dir -o domain=A,username=B,password='C',sec=ntlmssp,file_mode=0700,dir_mode=0700

$ tail -n 1 /etc/fstab
//w.x.y.z/Home$ /mnt/dir cifs domain=A,username=B,password='C',sec=ntlmssp,file_mode=0700,dir_mode=0700

$ sudo mount /mnt/csif
mount error(13): Permission denied
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)

//w.x.y.z/Home$ /mnt/dir cifs credentials=/home/username/cifs.creds,sec=ntlmssp,file_mode=0700,dir_mode=0700

domain=A
username=B
password=C