The tangent to a given curve $y=f(x)$ is perpendicular to the $x$-axis,if

  • A
    $\frac{dy}{dx}=1$
  • B
    $\frac{dx}{dy}=0$
  • C
    $\frac{dx}{dy}=1$
  • D
    $\frac{dy}{dx}=0$

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