A certificate authority $($CA$)$ in a public key infrastructure $($PKI$)$ system has many functions. Which of the following best describes the certificate issuer?

Question $10$ options:

A$)$

Validates the subscriber's credentials for the registration authority prior to the request for the digital certificate

B$)$

Distributes the certificates that are generated by the certificate manufacturer

C$)$

Responsible for establishing, distributing, maintaining, promoting, and enforcing all of the policies of the individual functions

D$)$

Generates and manages the digital certificate asymmetric key pairs