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If $V_{mc}=$ cutting speed for the minimum cost and $V_{mat}=$ cutting speed for the minimum time, then for high efficiency range, which one of the following is true for cutting speed?

(a) Between $V_{mat}$ and $V_{mc}$

(b) $\leq V_{mc}$

(c) $\geq V_{mt}$

(d) $\leq V_{mat}$

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