What activity is prohibited regarding the use of alcoholic beverages while on duty?

The prohibition against having alcoholic beverages in possession while on duty stems from safety regulations that prioritize the well-being of both employees and the general public. This rule is designed to eliminate any potential risk that may arise from the presence of alcohol, which can impair judgment, decrease alertness, and ultimately compromise safety on the job.

By prohibiting possession, the policy aims to create a clear and consistent standard that ensures all employees are fully focused and capable of performing their duties without the distraction or influence of alcohol. This helps maintain a safe working environment and fosters a culture of responsibility and professionalism.

In contrast, the other options suggest allowances or conditions under which alcoholic beverages could be present or consumed, such as in designated areas or in moderation. These approaches could create ambiguity and potential safety risks, which is why they are not consistent with the strict prohibition outlined in the correct choice.