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Let A be the centre of the circle `x^(2)+y^(2)-2x-4y-20=0`. If the tangents at the points B (1, 7) and `D(4, -2)` on the circle meet at the point C, then the perimeter of the quadrilateral ABCD is

A

60 units

B

20 units

C

40 units

D

50 units

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The correct Answer is:
C
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