Which of the following is a safety measure when encountering a yellow polly bag?

When encountering a yellow polly bag, the appropriate safety measure is to secure the area and contact the appropriate personnel. Yellow polly bags are often used to indicate the presence of potentially hazardous materials, such as biohazardous or chemical waste. By securing the area, you prevent unauthorized access and ensure the safety of personnel who might be in the vicinity. This initial precaution is crucial in minimizing exposure and risk until the situation can be assessed properly.

Contacting the appropriate personnel, such as the command's safety officer or hazardous materials team, ensures that the situation is handled by trained experts. They have the knowledge and resources to address any potential hazards effectively and safely remove or manage the contents of the bag.

This approach aligns with safety protocols aimed at maintaining a secure and healthy environment, especially in sensitive settings like military operations, where hazards may not always be immediately evident.