What is one of the primary communication methods a watchperson should use?

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A two-way radio or mobile phone is essential for a watchperson as it allows for immediate and efficient communication, especially during emergencies. This method enables the watchperson to quickly alert other staff, call for assistance, or report issues to emergency services, which is critical for ensuring safety and security at construction sites. The ability to communicate instantly can significantly mitigate potential dangers and coordinate an effective response in high-pressure situations, ensuring that the safety protocols are followed and that everyone remains informed. Other options, while they may have their place in specific scenarios, lack the immediacy and effectiveness of real-time voice communication that is crucial for emergencies.