Company A submitted a bid on a contract to do work for Company B via email. Company B was
insistent that the bid did not come from Company A. Which of the following would have assured
that the bid was submitted by Company A?

A.
Steganography

B.
Hashing

C.
Encryption

D.
Digital Signatures

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.