Which of the following is the MOST important consideration when securing customer credit card
data acquired by a point-of-sale (POS) cash register?

A.
Authentication

B.
Hardening

C.
Encryption

D.
Nonrepudiation

Explanation:

Cardholder data should be encrypted using strong encryption techniques. Hardening would be
secondary in importance, while nonrepudiation would not be as relevant. Authentication of the
point-of-sale (POS) terminal is a previous step to acquiring the card information.