Electrochemical grinding removes material by... A... And...

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Electrochemical grinding removes material by... A... And... B... processes.
A. electrochemical/chemical
B. mechanical/chemical

1. A. (chemical ) and B. (Mechanical)
2. A. (Electrochemical) and B. (chemical )
3. A. (Electrochemical) and B. (Mechanical)
4. A. (chemical ) and B. (chemical )

Correct Option: C

A. (Electrochemical) and B. (Mechanical)