Match the following non-traditional machining processes

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Match the following non-traditional machining processes with the corresponding material removal mechanisms:
Machining process
P. Chemical machining
Q. Electro-chemical machining
R. Electro-discharge machining
S. Ultrasonic machining
Mechanism of material removal
1. Erosion
2. Corrosive reaction
3. lon displacement
4. Fusion and vaporization

1. P-2, Q-3, R-4, S-1
2. P-2, Q-4, R-3, S-1
3. P-3, Q-2, R-4, S-1
4. P-2, Q-3, R-1, S-4

Correct Option: A

P – 2, Q – 3, R – 4, S – 1