Which of the following types of trust models is used by a PKI?

A.
Transitive

B.
Open source

C.
Decentralized

D.
Centralized

Explanation:
PKI uses a centralized trust model. In a simple PKI a single centralized certification authority (CA). In a
hierarchical trust model the root CA is the center of the model, with subordinate CAs lower in the hierarchy.
Note: A public key infrastructure (PKI) is a set of hardware, software, people, policies, and procedures needed
to create, manage, distribute, use, store, and revoke digital certificates.
A trust Model is collection of rules that informs application on how to decide the legitimacy of a Digital
Certificate.