A digital signature is required—
(I) To tie an electronic message to the
sender’s identity
(II) For non repudiation of communication
by a sender
(III) To prove that a message was sent by the
sender in a court of law
(IV) In all e-mail transactions
(A) I and II
(B) I, II, III
(C) I, II, III, IV
(D) II, III, IV
