Which of the following describes a key responsibility of a security guard?

A key responsibility of a security guard is conducting surveillance of the premises. This involves actively monitoring the environment to identify any suspicious activities or potential threats that could compromise the safety and security of the area they’re assigned to protect. Surveillance can include watching for unauthorized individuals, observing the behavior of people in the vicinity, and utilizing security cameras or patrol techniques to ensure that all areas are secure. This vigilance helps to deter crime and provides a quick response in emergency situations.

In contrast, providing entertainment for guests, managing finances, and buying supplies do not fall under the traditional roles and responsibilities of a security guard. These tasks either pertain to hospitality services, financial management, or administrative duties that security personnel are not typically trained or expected to handle. Thus, conducting surveillance encapsulates the primary function of a security guard's job, which is to maintain safety and security through observation and detection.