Let P(asecθ, btanθ) and Q(asecφ, btanφ) where θ = π/2, be two points on the hyperbola xy (d)o' = b'm' = 1. If (h, k) is the point of intersection of the normals at P and Q, then k is equal to:
A) -1
B) 1
C) 0
D) None of the above