Alex and Peter Work in an Air Traffic Control Tower

Alex and Peter work in an air traffic control tower. They are assigned with the task of monitoring signals on the radar to detect incoming planes. Alex tells Peter that he detected a signal on the radar. However, Peter does not agree with Alex. After further checks, they concur that there was no signal on the radar. Signal detection theorists would label Alex's initial report that he detected a signal as a ________.

A) miss
B) hit
C) correct rejection
D) false alarm