During the preflight of the Mega Phone, what must be verified?

Verifying that the Mega Phone is secured in its bracket and that an audible click is heard is essential for ensuring that the device is properly stowed and ready for use in an emergency. This step confirms that the Mega Phone will not become dislodged during the flight, which could lead to difficulties in accessing it quickly should an emergency arise. The audible click serves as a tactile and auditory cue that the device is firmly in place, helping to prevent any potential mishaps regarding equipment positioning.

Other options, while still important aspects of equipment checks, do not specifically address the critical need for security and readiness of the Mega Phone during preflight procedures. Ensuring that it is securely stowed is paramount for the safety and efficiency of emergency response efforts.