Medium
Let $f$ be a function that is continuous and differentiable for all real $x$. If $f(2) = -4$ and $f'(x) \geq 6$ for all $x \in [2, 4]$,then which of the following is true?
- A$f(4) < 8$
- B$f(4) \geq 8$
- C$f(4) \geq 12$
- DNone of these
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