Let $f(x)$ satisfy the requirements of Lagrange's Mean Value Theorem in $[0, 2]$. If $f(0) = 0$ and $|f'(x)| \leqslant \frac{1}{2}$ for all $x \in [0, 2]$,then-

  • A
    $f(x) \geqslant 2$
  • B
    $|f(x)| \leqslant 1$
  • C
    $f(x) = 2x$
  • D
    $f(x) = 3$ for at least one $x$ in $[0, 2]$

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