If \( \mathrm{A} \) is an \( 3 \times 3 \) non-singular matrix such that \( A A^{T}=A^{T} A \) a....

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If \( \mathrm{A} \) is an \( 3 \times 3 \) non-singular matrix such that
\( \mathrm{P} \)
\( A A^{T}=A^{T} A \) and \( B=A^{-T} A^{T} \) then \( B B^{T} \) equals:
W
(1) \( B^{-1} \)
(2) \( \left(B^{-1}\right)^{T} \)
(3) \( I+B \)
(4) \( I \)


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