The slope of the tangent of the curve $\left(\frac{x}{31}\right)^n + \left(\frac{y}{1209}\right)^n = 2$ at $(31, 1209)$ is:

  • A
    -$39$
  • B
    $39$
  • C
    $\frac{1}{39}$
  • D
    $\frac{-1}{39}$

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