CompTIA Security+ Question J-31

An encrypted message is sent using PKI from Emily, a client, to a customer. Emily claims she never sent the message. Which of the following aspects of PKI BEST ensures the identity of the sender?

B. Non-repudiation
C. Trust models
D. Recovery agents

Answer: B

Nonrepudiation prevents one party from denying actions they carried out. This means that the identity of the email sender will not be repudiated.