Secure customer use of an e-commerce application can BEST be accomplished through:

A.
data encryption.

B.
digital signatures.

C.
strong passwords.

D.
two-factor authentication.

Explanation:

Encryption would be the preferred method of ensuring confidentiality in customer communications with an ecommerce application. Strong passwords, by themselves, would not be sufficient since the data could still be intercepted, while two-factor authentication would be impractical. Digital signatures would not provide a secure means of communication. In most business-to-customer (B-to-C) web applications, a digital signature is also not a practical solution.