Bianca Manages the E-Mail Server for Fictional Corp

Multiple Choice

Bianca manages the e-mail server for Fictional Corp. All of the employees' e-mails are encrypted using the user's keys. One of the user's certificates expires, so a new certificate is installed. However, now they can no longer access their archived e-mails. Which of the following does Bianca need to do to give this user access to their archived e-mails?

A) Uninstall the new certificate and reinstall the old one.
B) Delete the archived e-mails.
C) Transfer the old certificate keys to the new certificate.
D) Import the keys for the old certificate so the e-mails can be decrypted and then re-encrypt them using the new certificate.