【单选题】
A A.ON, activates the standby pump and arms the ALTERNATE FLAPS position switch.
B B.STBY, activates the standby pump and arms ALTERNATE FLAPS position switch.
C C.OFF, activates the PTU and arms the primary flap selector.
D D.ARM, closes trailing edge flap bypass valve, activates standby pump and arms ALTERNATE FLAPS position switch.
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