Let A be the centre of the circle x2 + y2 – 2x – 4y – 20 = 0. Let B(1, 7) and D(4, – 2) be two points on the circle such that tangents at B and D meet at C. The area of the quadrilateral ABCD is
(A) 150 sq. units
(B) 50 sq. units
(C) 75 sq. units
(D) 70 sq. units