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If A=[(1,2,2),(2,1,-2),(c,2,b)] is a mat...

If `A=[(1,2,2),(2,1,-2),(c,2,b)]` is a matrix satisfying the equation `A A^T=9I`, where `I` is `3xx3` identity matrix, then the ordered pair `(a,b)` is equal to :
(A) `(2,-1)`
(B) `(-2,1)`
(C) `(2, 1)`
(D) `(-2,-1)`
Answer - D

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