If $f(x) = 3x + 10$ and $g(x) = x^2 - 1$,then $(fog)^{-1}$ is equal to

  • A
    $(\frac{x - 7}{3})^{1/2}$
  • B
    $(\frac{x + 7}{3})^{1/2}$
  • C
    $(\frac{x - 3}{7})^{1/2}$
  • D
    $(\frac{x + 3}{7})^{1/2}$

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