If A = {−2,−1, 0,1,2} and f : A → B is an onto function defined by f (x) = x² + x + 1, then find B.
A.B = {1, 3}
B.B = {-1,3, 7}
C.B = {-1,-3, -7}
D.B = {1, 3, 7}