Vector $P = 6 \hat{i} + 4 \sqrt{2} \hat{j} + 4 \sqrt{2} \hat{k}$ makes an angle with the $z$-axis equal to:

  • A
    $\cos^{-1}\left(\frac{\sqrt{2}}{5}\right)$
  • B
    $\cos^{-1}(2 \sqrt{2})$
  • C
    $\cos^{-1}\left(\frac{2 \sqrt{2}}{5}\right)$
  • D
    None of these

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