What security control provides a method to insure that a transaction did or did not occur?

A.
Identification

B.
Accountability

C.
Nonrepudiation

D.
Verification

E.
Access control

Explanation:
Nonrepudiation serves to validate whether or not a claimed event or action occurred in order to resolve disputes about the validity of the event. Nonrepudiation is vital in electronic commerce because it protects both the seller and the consumer from fraudulent behavior by the other party.