$\vec{A}$ is a vector quantity such that $|\vec{A}| =$ nonzero constant. Which of the following expressions is true for $\vec{A}$?

  • A
    $\vec{A} \cdot \vec{A} = 0$
  • B
    $\vec{A} \times \vec{A} < 0$
  • C
    $\vec{A} \times \vec{A} = 0$
  • D
    $\vec{A} \times \vec{A} > 0$

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