Part of your responsibilities include maintaining the root CA as well as the intermediate CAs for a large organization. What should you do to ensure the security of the root CA$?$

a$.$ Allow local access only from an isolated network.

b$.$ Require two$-$factor authentication for local and remote access.

c$.$ Keep it powered down until you need to issue or reissue cerdfcates.

d$.$ Ensure all traffic flowing to and from the root CA is enceypted and disable wire less access