The area of the triangle formed by the positive $x$-axis and the normal and the tangent to the circle $x^2 + y^2 = 4$ at $(1, \sqrt 3 )$ is

  • A

    $2\sqrt 3$

  • B

    $\sqrt 3$

  • C

    $1/\sqrt 3$

  • D

    $1$

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  • [IIT 1985]