If \(A= \begin{bmatrix} {1} & {-1} \\[0.3em] 2 & -1 \ \\[0.3em] \end{bmatrix} \) , \(B= \begin{bmatrix} {a} & {1} \\[0.3em] b & -1 \ \\[0.3em] \end{bmatrix} \) and (A + B)2 = A2 + B2, then the value of a and b are
1
a = 4, b = 1
2
a = 1, b = 4
3
a = 0, b = 4
4
a = 2, b = 4