Assertion (A) : A diamond tool is used for USM of glass

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Assertion (A) : A diamond tool is used for USM of glass workpiece.
Reason (R) : Diamond is harder than glass

1. Both A and R are true and R is the correct explanation of A
2. Both A and R are true but R is not a correct explanation of A
3. A is true but R is false
4. A is false but R is true

Correct Option: D

Soft tool material must be used in order to avoid tool wear.