$\int_0^k(\sqrt{k}-\sqrt{t})^2 \, dt =$

  • A
    $\frac{k^2}{2}$
  • B
    $\frac{k^2}{4}$
  • C
    $\frac{k^2}{6}$
  • D
    $\frac{k^2}{8}$

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