A digital signature using a public key infrastructure (PKI) will:

A.
not ensure the integrity of a message.

B.
rely on the extent to which the certificate authority (CA) is trusted.

C.
require two parties to the message exchange.

D.
provide a high level of confidentiality.

Explanation:

The certificate authority (CA) is a trusted third party that attests to the identity of the signatory, and

reliance will be a function of the level of trust afforded the CA. A digital signature would provide a
level of assurance of message integrity, but it is a three-party exchange, including the CA. Digital
signatures do not require encryption of the message in order to preserve confidentiality.