If $a = t^2 \hat{i} + e^t \hat{j} + \hat{k}$ and $b = 2 \hat{i} + t^2 \hat{j} + \log t \hat{k}$,and $f(t) = a \cdot b$,then $f^{\prime}(1)$ is equal to

  • A
    $3 + 5e$
  • B
    $5 + 3e$
  • C
    $3 + 3e$
  • D
    $4 + 3e$

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