Final answer:
Guard safety on patrol requires elevated awareness, particularly of their location and surroundings, which is essential for effective response to incidents. Additionally, maintaining a professional appearance and knowing safety equipment locations are important.
Step-by-step explanation:
Guard safety on patrol must include an elevated level of awareness in several areas to ensure both personal safety and the protection of the premises being patrolled. While not explicitly listed as options, the principles of avoiding distracting clothing and maintaining proper personal hygiene are fundamental for a professional appearance and for not detracting from the primary duties of patrol.
In addition to personal presentation, being aware of specific safety equipment locations like the fire extinguisher and eyewash station is crucial, especially in a laboratory setting. However, for the choices provided, guards on patrol must always be aware of 'D. Their location and surroundings.' This is essential for effective patrolling, as it enables the guard to respond promptly and correctly to any incidents or emergencies. Knowledge of port orders, rules and regulations, and the time and weather, while important, are secondary to situational awareness.