What Must Be Done to Ensure the Samba Password Is

What must be done to ensure the Samba password is kept synchronized when a user changes their Linux password?

A) Samba and linux passwords can only be kept in sync when Samba uses the passwdsam password backend, which reads the password from /etc/passwd . Samba and linux passwords can only be kept in sync when Samba uses the passwdsam password backend, which reads the password from /etc/passwd .
B) /usr/bin/passwd should be replaced by a symlink to /usr/bin/smbpasswd . /usr/bin/passwd should be replaced by a symlink to /usr/bin/smbpasswd
C) In /etc/nsswitch.conf , the samba service should be added to password and shadow before the file service. In /etc/nsswitch.conf , the samba service should be added to password and shadow before the file service.
D) pam_smbpass.so should be added to the password type of the appropriate PAM configuration.
E) Winbindd must be running on the Linux server in order to replicate the password changes back to Samba.