An IT environment with a bastion host, an intrusion prevention system, and workstation antivirus and firewall software is an example of .

The correct answer is letter "B": defense in depth.

Explanation:

Defense in depth refers to a layered Information Technology (IT) system that aims to give maximum protection to companies in front of malicious attacks. The system combines the firm's data, applications, hosts, internal network, perimeter, and its policies and procedures.

Defense in depth groups comprehensive strategies to apply the proper policies and procedures set up by a company in an attempt to join them with IT software that would increase the response and speed reaction of the entity in front of risks.