The question is incomplete. There are no options given (for "which of the following") to answer this question.
None
None of the above
None of the above have permission to croos the runway without contacting the Control Tower for approval
Emergency vehicles must always assume that a runway is being used for air traffic, even after an emergency landing. They must wait until cleared by the tower before moving onto the runway and not assume they can go once the emergency craft has landed.
none of the above
none of the above
Depending on the airport and the regulations in place, any vehicle can cross the runway provided it is in radio communication with the tower and has had clearance to cross. The would also need to advise the tower when they had cleared or "vacated" the runway. In an emergency, the main vehicles given permission to cross or even enter the runway would be the "crash" trucks and the ATC supervisor. They would still need permission to enter the runway.
none of the above
Emergency vehicles, such as fire trucks and ambulances, may be authorized to cross a runway without contacting the control tower in case of an emergency. These vehicles are trained to respond quickly to urgent situations and may have direct access to the runway to provide immediate assistance.
False
If you mean the light gun signals from the control tower- to vehicles, and aircraft on the ground, get off the runway. For aircraft in flight, runway is unsafe, do not land.
You must request permission to cross Runway 22 again with confirmation by light gun.