Which of the following is a primary responsibility of a security guard?

The primary responsibility of a security guard is to monitor and ensure the safety of the premises. This role is essential to maintaining a secure environment for both people and property. Security guards are tasked with observing and reporting any suspicious activities or behaviors, ensuring that access control measures are enforced, and responding to emergencies such as theft, vandalism, or threats to personal safety. By actively monitoring the area, security guards play a crucial role in deterring crime and providing a sense of security to individuals within their environment.

The other options relate to business functions that are outside the typical scope of a security guard's duties. Negotiating business contracts or overseeing marketing efforts involves skills and responsibilities tied to business operations rather than security and protection. Similarly, maintaining high-level corporate strategy is a managerial task that requires extensive planning and analysis, which does not pertain to the day-to-day responsibilities of a security guard.