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Which among the following statements is incorrect?

A)  Equal chords subtend equal angles at the centre of the circle.

B)  The opposite angles of a cyclic quadrilateral are supplementary.

C)  A line drawn through the end point of a radius of a circle and perpendicular to it is a tangent to the circle.

D) The number of common tangents to two circles touching externally is four.

E) None of these