A parabola C whose focus is S(0,0) and passing through P(3, 4). Equation of tangent at P to parabola is 3x + 4y -25 = 0. A chord through S parallel to tangent at P intersects the parabola at A and B. Which of the following are CORRECT ?

(A) Length of AB is 20 units

(B) Latus rectum of parabola is 20 units

(C) Only one real normal can be drawn from the point (-3, -4)

(D) Only one real normal can be drawn from the point (-6, -8)