If A=[1-1 2-1] , B=[a1b-1] and (A+B)^2=A...

If `A=[1-1 2-1]` , `B=[a1b-1]` and `(A+B)^2=A^2+B^2` , then values of `a` and `b` are `a=4` , `b=1` (b) `a=1` , `b=4` (c) `a=0` , `b=4` (d) `a=2` , `b=4`

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