What are the parameters for wing-waggle/cross turn (II)?

The correct choice for the parameters of wing-waggle/cross turn (II) is indeed centered around 0-90 degrees of bank. This range allows for a wide margin of flexibility in maneuvering during formation flying, enabling pilots to make significant adjustments to spacing and alignment between aircraft.

In the context of formation flying, wing-waggles are typically used as visual cues to communicate intentions to other pilots, especially when adjusting formations or aligning for maneuvers. The ability to bank up to 90 degrees provides pilots with the necessary control to decrease or increase their relative position to the lead aircraft effectively, which is crucial in maintaining formation integrity.

The other choices present narrower bank angles that would restrict a pilot's ability to execute necessary formation changes. For instance, options that suggest banks of 60 degrees or less would limit the effectiveness of the maneuvers required for smooth and responsive adjustments, which are essential in close formation flying, especially in dynamic environments or during specific tactical scenarios.