The locus of point the chord of contact of tangents from which to the ellipse x²/a² + y²/b²=1 touches the circle x²+y²=c² is
A. b⁴c²x²+a⁴c²y²=a⁴b⁴
B. b²c²x²+a²c²y²=1
C. b⁴c²x²+a⁴c²y²=1
D. None of the above