The equation to the straight line passing through the point (a cosθ³, a sinθ³) and is perpendicular to the line xsecθ + y cosecθ = a, is:
a. x cosθ - y sinθ = a cos 2θ
b. x cosθ + y sinθ = a cos 2θ
c. x sinθ + y cosθ = a cos 2θ
d. None of these