\( D \) is a \( 3 \times 3 \) diagonal matrix. Which of the following statements are not true? (...

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\( D \) is a \( 3 \times 3 \) diagonal matrix. Which of the following statements are not true?
(a) \( D^{T}=D \)
(b) \( A D=D A \) for every matrix \( A \) of order \( 3 \times 3 \)
(c) \( D^{-1} \) if exists is a scalar matrix
(d) None of the above
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