If the vectors $2 \bar{i} + 4 \bar{j} - 3 \bar{k}$,$-\bar{i} + 2 \bar{j} + 3 \bar{k}$,and $p \bar{i} - 2 \bar{j} + \bar{k}$ are coplanar,then the unit vector in the direction of the vector $9p \bar{i} - 4 \bar{j} + 4 \bar{k}$ is

  • A
    $\frac{1}{6}(2 \bar{i} - 4 \bar{j} + 4 \bar{k})$
  • B
    $\frac{1}{9}(7 \bar{i} - 4 \bar{j} + 4 \bar{k})$
  • C
    $\frac{1}{9}(7 \bar{i} + 4 \bar{j} - 4 \bar{k})$
  • D
    $\frac{1}{9}(-7 \bar{i} - 4 \bar{j} + 4 \bar{k})$

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