For $A = \begin{bmatrix} 0 & 0 & -2 \\ 0 & -2 & 0 \\ -2 & 0 & 0 \end{bmatrix}$,which of the following is true?

  • A
    $A^2 = 4I$
  • B
    $A = -2I_3$
  • C
    $A^{-1}$ does not exist.
  • D
    $A$ is a diagonal matrix.

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