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Match the functions with their graphs.

1. $\frac{1}{x^{2}-1}$
2. $\frac{x^{2}}{x^{2}+1}$
3. $\frac{1}{x^{2}+1}$
4. $\frac{x}{x^{2}-1}$

A.
B.
C.
D.

You can earn partial credit on this problem.