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 Assertion (A): In ECM, the shape of the cavity is the mirror image of the tool, but unlike EDM, the tool wear in ECM is less.

Reason (R): The tool in ECM is a cathode.

(a) Both A & R are true & R is the correct explanation of A                           

 (b) Both A and R are true but R is NOT the correct explanation of A

(c) A is true but R is false

(d) A is false but R is true       

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