Which of the following statements are true?

A. The tangent at any point of a circle is perpendicular to the radius through the point of contact.

B. Infinite number of tangents can be drawn to a circle from a point lying outside the circle.

C. The tangents drawn to a circle at the end points of a diameter are parallel.

D. The lengths of tangents drawn from an external point to a circle are equal.

Choose the correct answer.