You need to design a PKI solution whilst ensuring your solution meets business and security requirements.
What should you do?

A.
You should consider implementing an enterprise root CA in the gnb.com domain You should then implement a stand-alone root CA in both the ch.gnbank.com and the la.gnb.com domains

B.
You should consider implementing an enterprise root CA in both the ch.gnbank.com and the la.gnb.com domains You should then take the enterprise CA in each domain offline

C.
You should consider implementing an enterprise root CA in the gnb.com domain

D.
You should consider implementing an enterprise root CA in the gnb.com domain You should then implement subordinate CAs in both the ch.gnbank.com and the la.gnbank.com domains and take the root CA offline