Indications for Aircraft Pushback include which of the following?

The arrival of wing walkers and a retracted jetway are crucial indications for aircraft pushback, as they signal that it is safe for the aircraft to begin its movement away from the gate. Wing walkers are ground personnel responsible for ensuring a safe environment around the aircraft during pushback operations. Their presence indicates that the area is clear of any obstructions that might pose a risk to the aircraft.

Additionally, the retraction of the jetway signifies that passengers are no longer boarding or disembarking, further indicating that the aircraft is ready to push back. These two factors together create a safe operational environment for completing the pushback maneuver.

While the other choices may also involve elements of the pushback process, they do not serve as direct indications that the aircraft is ready to begin pushback in the same clear and immediate way that wing walkers and a retracted jetway do.