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Let P(a sectheta, btantheta) and Q(asec...

Let `P(a sectheta, btantheta) and Q(asecphi , btanphi)` (where `theta+phi=pi/2`) be two points on the hyperbola `x^2/a^2-y^2/b^2=1` If `(h, k)` is the point of intersection of the normals at `P and Q` then `k` is equal to
(A) `(a^2+b^2)/a` (B) `-((a^2+b^2)/a)` (C) `(a^2+b^2)/b` (D) `-((a^2+b^2)/b)`

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