Which of the listed items should be secured before performing any maintenance on a solenoid operated air start valve?（）<br>A:Electric power and starting air<br>B:Lube oil standby pump and control air<br>C:Hydraulic switch and engage jacking gear<br>D:Motor drain and pneumatic control system power

Which of the listed items should be secured before performing any maintenance on a solenoid operated air start valve?（）
A:Electric power and starting air
B:Lube oil standby pump and control air
C:Hydraulic switch and engage jacking gear
D:Motor drain and pneumatic control system power

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