Let $f(x)$ be a non-negative differentiable function on $[0, \infty)$ such that $f(0)=0$ and $f^{\prime}(x) \leq 2 f(x)$ for all $x>0$. Then,on $[0, \infty)$:

  • A
    $f(x) = 0$ for all $x \geq 0$
  • B
    $f(x)$ is strictly increasing
  • C
    $f(x)$ is strictly decreasing
  • D
    $f^{\prime}(x)$ changes sign

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