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What are the major indications of an incipient retreating blade stall situation, in order of occurrence?
| | A) Low-frequency vibration, pitchup of the nose, and a roll in the direction of the retreating blade. |
| | B) Slow pitchup of the nose, high-frequency vibration, and a tendency for the helicopter to roll. |
| | C) Slow pitchup of the nose, tendency for the helicopter to roll, followed by a medium-frequency vibration. |
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