The least natural number \( a \) for which \( x+a x^{-2}2 \) \( \forall x \in(0, \infty) \) is (...

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The least natural number \( a \) for which \( x+a x^{-2}2 \) \( \forall x \in(0, \infty) \) is
(A) 1
(B) 2
(C) 5
(D) None of these
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