If $f(x) = \int_{-1}^{x} |t| dt$,then for any $x \geq 0$,$f(x)$ is equal to

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

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