What must the Certificate Authorities (CAs) establish so that the private PKIs for Company A and Company B …?

Company A and Company B have just merged and each has its own Public Key Infrastructure
(PKI). What must the Certificate Authorities (CAs) establish so that the private PKIs for Company

A and Company B trust one another and each private PKI can validate digital certificates from the
other company?

A.
Poly key exchange

B.
Cross certification

C.
Poly key reference

D.
Cross-site exchange