In which of following cases originator of defamatory statement will be liable for the damage resulting from repetitive publication by third persons ? Answer by using codes below :

a.    He himself authorized repetition.
b.    Repetition was the natural and probable consequence of his act.
c.    There was immoral obligation on the person in whose presence the slander was made to repeat it.
d.    There was moral obligation on the person in whose absence the slander was made to repeat it.
Codes :