Match the items in columns I and II.
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Column I
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Column II
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P: Centrifugal compressor
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1: Axial flow
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Q: Centrifugal pump
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2: Surging
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R: Pelton wheel
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3: Priming
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S: Kaplan turbine
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4: Pure impulse
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(a) P-2, Q-3, R-4, S-1
(b) P-2, Q-3, R-1, S-4
(c) P-3, Q-4D, R-1, S-2
(d) P-1, Q-2, R-3, S-4