If A=[1 2 2 2 1-2a2b] is a matrix satisf...

If `A=[1 2 2 2 1-2a2b]` is a matrix satisfying the equation `AA^T=""9I` , where `I` is `3xx3` identity matrix, then the ordered pair (a, b) is equal to : (1) `(2,-1)` (2) `(-2,""1)` (3) (2, 1) (4) `(-2,-1)`

A

(2,-1)

B

(-2,1)

C

(2,1)

D

(-2,-1)

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The correct Answer is:

D

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