If you activate the FLT CONTROL switch Overhead panel) to STBY RUD, you activate:
A.A.standby hydraulic system pump
B.B.standby hydraulic system pump and close flight control shutoff valve, isolating ailerons and elevators
C.C.activates standby hydraulic system pump and opens standby rudder shutoff valve to pressurize standby rudder power control unit
正确答案是C