Exhaustive set of values of m for which there exists two points P and Q lying on the line y = mx + 8, such that ∠APB = ∠AQB = π/2,
Where A (-4,0) and B(4, 0), is given by (– [infinity], a) ⋃ (b, [infinity]) – {c, d} then
A. a + b = c + d
B. c + d = 0
C. a² + b² = 6
D. c² + d² = 4