Match the items in columns I and II.
Column I
P: Centrifugal compressor
Q: Centrifugal pump
R: Pelton wheel
S: Kaplan turbine
Column II
1: Axial flow
2: Surging
3: Priming
4: Pure impulse
A. P−2,Q−3,R−4,S−1
B. P−2,Q−3,R−1,S−4
C. P−3,Q−4,R−1,S−2
D. P−1,Q−2,R−3,S−4