If $x = \log t, t > 0$ and $y = \frac{1}{t}$,then $\frac{d^2 y}{d x^2} =$

  • A
    $\frac{dy}{dx}$
  • B
    $-\frac{dy}{dx}$
  • C
    $2y$
  • D
    $\frac{y}{x}$

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