If the eccentricity of the hyperbola $\frac{x^2}{a^2}-\frac{y^2}{b^2}=1$ is $\sec \alpha$,then the area of the triangle formed by the asymptotes of the hyperbola with any of its tangent is

  • A
    $a^2 b^2 \sec^2 \alpha$
  • B
    $ab$
  • C
    $a^2 \tan^2 \alpha$
  • D
    $(a^2+b^2) \tan^2 \alpha$

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