【单选题】
A A.Yaw Damper, Alternate Brakes, Autopilot A, Trailing Edge Flaps
B B.Main Yaw Damper, Normal Brakes, Autopilot B, Trailing Edge Flaps
C C.Standby Yaw Damper, Normal Brakes, Autopilot A, Flight Spoilers
D D.Ground Spoilers, Normal Brakes, Autopilot B, Trailing Edge Flaps
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