counter sinking is the operation of: (a) Enlarging the end of a hole cylindrically (b) Cone-shaped of

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counter sinking is the operation of:

(a) Enlarging the end of a hole cylindrically

(b) Cone-shaped of the enlargement of the end of a hole

(c) Smoothing and squaring the surface around a hole

(d) Sizing and finishing a hole

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