If A is an 3 × 3 non-singular matrix such that AA^'=A^'A and B=A^-1 A^',

If A is an 3 × 3 non-singular matrix such that AA^'=A^'A and B=A^-1 A^', the BB^' equals :
(1) I+B
(2) I
(3) B^-1
(4) (B^-1)^'
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