If $\vec{a} = 3\hat{i} - 6\hat{j} - 24\hat{k}$,then which of the following vectors is perpendicular to $\vec{a}$?

  • A
    $\hat{i} + \hat{j} + \hat{k}$
  • B
    $2\hat{i} + 5\hat{j} - \hat{k}$
  • C
    $-2\hat{i} - 5\hat{j} - \hat{k}$
  • D
    $-3\hat{i} - 6\hat{j} + 24\hat{k}$

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