Equation of normal to parabola `y^2 = 4ax` at `(at^2, 2at)` is `y-2at = -t(x-at^2) i.e. y=-tx+2at + at^3` Greatest and least distances between two curves occur along their common normals. Least and greatest distances of a point from a curve occur along the normal to the curve passing through that point. The number of normal(s) from point `(7/6, 4)` to parabola `y^2 = 2x -1` is (A) 1 (B) 2 (C) 3 (D) 0A. 1B. 2C. 3D. 0