What should Certkiller .com do when Certkiller .com’s intranet SSL certificate is no longer valid in Internet Explorer?

What should Certkiller .com do when Certkiller .com’s intranet SSL certificate is no longer valid in
Internet Explorer?

A.
Create a new SSL certificate.

B.
Create a new SSL cache.

C.
Clear the SSL cache.

D.
Delete temporary internet files.