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