What is the range of values for $\frac{x}{x^2 + 4}$ for all real values of $x$?
- A$\frac{-1}{2} \le y \le \frac{1}{2}$
- B$\frac{-1}{4} \le y \le \frac{1}{4}$
- C$\frac{-1}{6} \le y \le \frac{1}{6}$
- DNone of these
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