If the probability density function of a continuous random variable $X$ is $f(x) = \frac{x^3}{3}$ for $-1 < x < 2$,and $f(x) = 0$ otherwise,then the cumulative distribution function $F(x)$ for $-1 < x < 2$ is:

  • A
    $\frac{1}{14}(x^4 - 1)$
  • B
    $\frac{1}{10}(x^4 - 1)$
  • C
    $\frac{1}{12}(x^4 - 1)$
  • D
    $\frac{1}{16}(x^4 - 1)$

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