For the function \( f(x)=x^{2}-6 x+8,2 \leq x \leq 4 \), the value ...

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For the function \( f(x)=x^{2}-6 x+8,2 \leq x \leq 4 \), the value of \( x \) for which \( f^{\prime}(x) \) vanishes is
(A) 3
(B) \( \frac{5}{2} \)
\( \mathrm{P} \)
(C) \( \frac{9}{4} \)
(D) \( \frac{7}{2} \)
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