The greatest value of \( \frac{1}{4 x^{2}+2 x+1}, x \in R \) is (a) \( 3 / 4 \) (b) \( 4 / 3 \) ...

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The greatest value of \( \frac{1}{4 x^{2}+2 x+1}, x \in R \) is
(a) \( 3 / 4 \)
(b) \( 4 / 3 \)
(c) \( 5 / 2 \)
(d) \( 2 / 5 \)
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