What is the function of the Bomba de Combustible de simple Efecto? I- Push the fuel through the roller tappet and rod to the piston forward. II- T...

What is the function of the Bomba de Combustible de simple Efecto?

I- Push the fuel through the roller tappet and rod to the piston forward.
II- Transport the fuel with the suction valve closed by the pressure valve to the pressure chamber (intermediate stroke).
III- Compress the pressure spring and the pressure valve loaded with a spring closes again at the end of the stroke.
IV- Send a part of the fuel from the pressure chamber (high amount per stroke), through the filter, to the injection pump.
V- Simultaneously aspirate fuel to the suction chamber from the tank, through the previous purifier and suction valve.
VI- There is only one lifting stroke every second stroke of the piston.
a) I, II, III, IV, V and VI are correct.
b) Only I, II, IV and V are correct.
c) Only III, IV, V and VI are correct.
d) Only II, IV, V and VI are correct.