In which of the following (unusual) cases/situations may we accept natural longitudinal instability of an airplane?

Question

Answer

For a commercial passenger airplane in cruise while fuel is being transferred to the rear tanks in the empennage.

Answer

For an airplane with canard configuration and the elevator ahead of the center of gravity.

Answer

For an airplane whose elevator is actuated by a stabilising automatic control system.

Answer

For an aerobatics airplane with manual controls.

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