An email client says a digital signature is invalid and the sender cannot be verified.
Which of the following concepts is the recipient concerned with?

A.
Integrity

B.
Availability

C.
Confidentiality

D.
Remediation

Explanation:
A digital signature is similar in function to a standard signature on a document. It validates the integrity of the
message and the sender. The message is encrypted using the encryption system, and a second piece of
information, the digital signature, is added to the message. Digital Signatures is used to validate the integrity of
the message and the sender. Integrity means the message can’t be altered without detection.