When a hydraulic vane pump is working, which of the following is in contact with the vanes？（1) the rotor; （2) the internal surface of the housing; （3) the external surface of the housing.

A.(1) only

B.(2) only

C.(1) and (2)

D.(1), (2) and (3)

请帮忙给出正确答案和分析，谢谢！

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When a hydraulic vane pump is working, which of the following is in contact with the vanes？ （1) the rotor; （2) the internal surface of the housing; （3) the external surface of the housing.