If the function \( f(x)=x^{2}+a / x \) has a local minimum at \( x=...

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If the function \( f(x)=x^{2}+a / x \) has a local minimum at \( x=2 \), then the value of \( a \) is
(a) 8
(b) 16
(c) 18
(d) 12
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