You are administrating a large hierarchal government environment in which a trust model needs to be established. The company does not want external CA’s involved in the verification process. Which of the following is the best trust model deployment for this scenario?

A.
A hierarchal first party trust model.

B.
A third party single CA trust model.

C.
A first party single CA trust Model.

D.
None of these will meet the needs of the company.