You need to design a PKI solution. In your solution take care to meet business and security requirements.
What should you do?

A.
Implement an enterprise root CA in the gnbank.com domain.
Implement subordinate CAs in both the ch.gnbank.com and the la.gnbank.com domains.
Take the root CA offline.

B.
Implement an enterprise root CA in the gnbank.com domain.

C.
Implement an enterprise root CA in both the ch.gnbank.com and the la.gnbank.com domains. Take the enterprise CA in each domain offline.

D.
Implement an enterprise root CA in the gnbank.com domain.
Implement a stand-alone root CA in both the ch.gnbank.com and the la.gnbank.com domains.