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

A.
CRL

B.
Non-repudiation

C.
Trust models

D.
Recovery agents

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