\( D \) is a \( 3 \times 3 \) diagonal matrix. Which of the followi...

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\( D \) is a \( 3 \times 3 \) diagonal matrix. Which of the following statements is not true?
(a) \( D^{\prime}=D \)
(b) \( A D=D A \) for each matrix of size \( 3 \times 3 \)
(c) \( D^{-1} \) if exists is a diagonal matrix
(d) \( D^{2} \) is a diagonal matrix
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