While attempting to create a user in the Samba database, the following message appeared:
# smbpasswd -a john
New SMB password:
Retype new SMB password:

…
Failed to initialise SAM_ACCOUNT for user john. Does this user exist in the UNIX password database?
Failed to modify password entry for user john
Select the correct explanation for why this error occurred.

A.
The user john must be created in the Linux environment before it can be added to the Samba database.

B.
The Samba database is not compatible with the Linux backend.

C.
The account user synchronization of Samba and Linux was not properly done.

D.
The SAM_ACCOUNT script could not be started properly because the user running the smbpasswd command does not have enough permissions.