What is one key responsibility of a security guard?

Monitoring security camera feeds is a key responsibility of a security guard as it plays a crucial role in maintaining safety and security in a given environment. By observing the footage from security cameras, guards can detect suspicious behavior, prevent potential incidents, and respond to emergencies in a timely manner. This task allows security personnel to keep a vigilant eye on the premises, ensuring that any threats or unauthorized activities are identified and addressed promptly.

The other options do not align with the primary responsibilities of a security guard. Preparing financial reports, managing inventory stock, and designing promotional materials are tasks typically associated with roles in finance, inventory management, and marketing, respectively, rather than in the realm of security and protection. Thus, monitoring security camera feeds stands out as a fundamental duty that directly contributes to safeguarding people and property.