Question $2(25$ points$)$

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A manufacturing process requires $12$ minutes of labor to make $10$ units of product. Which of the following actions will increase productivity?

Increase labor per $10$ units of production

Decrease labor per $10$ units of production

Increase number of units per $10$ minutes of labor

Decrease number of units per $12$ minutes of labor

A$)1$ and $3$ only

B$)1$ and $4$ only

C$)2$ and $3$ only

D$)2$ and $4$ only