Which of the following is an essential part of a Class D officer's duties?

Preventing theft is an essential part of a Class D officer's duties as it directly relates to maintaining safety and security within a facility or environment. Class D officers are often responsible for overseeing property, monitoring for suspicious activities, and taking proactive measures to deter theft and other criminal behaviors. This role includes being vigilant in observing and reporting any activities that could lead to theft, as well as implementing security measures to protect assets.

While elements like legal advice, media interaction, and conducting formal investigations may play a role in broader security operations, they do not pertain specifically to the primary responsibilities of a Class D officer, which primarily focus on safety and theft prevention within a designated area. Thus, the emphasis on theft prevention highlights the core function of protective duties that Class D officers are expected to fulfill.