Which signal is used when there is a need to relay in person?

The correct choice refers to Signal 29. This signal is specifically designated for situations where officers need to relay information in person. This is crucial in law enforcement, as some situations require direct communication to ensure clarity and to address any potential complications that could arise from misunderstandings in relayed messages.

Using Signal 29 indicates to other personnel that the officer needs to physically meet to discuss important details, which is often necessary in critical scenarios. The protocol of using specific signals helps maintain order and ensures that all officers are aware of the urgency and nature of communications. Clear communication is vital in law enforcement operations, and this signal supports that need effectively.