The curve y=x'-4r+4x*-4 has tangents parallel to the x-axis at the following points () (a) (1,4), (-2,2) and (0,-1) (b) (0,-4), (2,-4) and (1,-3) (c)(-1,2), (-2

The curve y=x'-4r+4x*-4 has tangents parallel to the x-axis at the following points () (A) (1,4), (-2,2) and (0,-1) (B) (0,-4), (2,-4) and (1,-3) (C)(-1,2), (-2,1) and (1,-2) (D) (1,-4), (1,-3) and (2,-4)