Which of the following incidents is a security officer most likely to respond to?

A security officer is most likely to respond to incidents involving theft or vandalism because their primary role is to protect property and ensure the safety of individuals in a designated area. Security officers are trained to identify, prevent, and respond to theft or vandalism incidents, which can have direct implications for the safety and security of the environment they are responsible for.

In situations of theft, a security officer may need to act quickly to prevent loss, gather evidence, and potentially apprehend suspects. Vandalism not only causes physical damage but can also contribute to a greater sense of insecurity among employees and visitors. Therefore, handling such incidents effectively is crucial to maintaining order and safety.

While human resources issues, marketing strategies, and employee training are all important functions within an organization, they typically fall outside the realm of a security officer's responsibilities. These areas pertain more to personnel management and business operations, which do not directly involve security enforcement or protection measures. A security officer’s focus remains on activities that pertain to safety and security, making theft or vandalism the most relevant scenario for their response.