If $A = \begin{bmatrix} i & 0 \\ 0 & i \end{bmatrix}$,then ${A^2} = $

  • A
    $\begin{bmatrix} 1 & 0 \\ 0 & -1 \end{bmatrix}$
  • B
    $\begin{bmatrix} -1 & 0 \\ 0 & -1 \end{bmatrix}$
  • C
    $\begin{bmatrix} 1 & 0 \\ 0 & 1 \end{bmatrix}$
  • D
    $\begin{bmatrix} -1 & 0 \\ 0 & 1 \end{bmatrix}$

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