CompTIA A+ 220-902 Question B-16

An end user calls the company’s IT service desk to report an inability to open encrypted emails on a mobile device. Which of the following BEST represents a possible cause?

A. A valid certificate suitable for S/MIME is not installed.
B. Emails received by the user lack suitable digital signatures.
C. SSL/TLS certificates stored on the device are expired.
D. The sender did not have the addressee’s public certificate.

Correct Answer: A