After receiving the digitally signed message from David, the key that should be used by Mike to verify the digital signature is David's public key. Hence, Option A is correct.
A digital sign or signature is done in electronic form. For doing a digital signature, the use of a mathematical algorithm is done. The major reason behind the use of digital signatures is the authenticity and integrity of a message.
Validation of an email, a credit card transaction, or a digital document can easily be done with it. One must keep the sign securely.
Thus, Option A is correct.
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The complete question is attached in text form:
When Mike receives the digitally signed message from David, what key should he use to verify the digital signature?
A. David's public key
B. David's private key
C. Mike's public key
D. Mike's private key
