The area $'A'$ of a blot of ink is growing such that after $t$ second its area is given by $A = (3t^2 + 7)\,cm^2$. Calculate the rate of increase of area at $t = 2\, sec$. .......... $cm^2/s$

  • A

    $6$

  • B

    $17$

  • C

    $12$

  • D

    $19$

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