Multiply And, If Possible, Simplify $\frac{x^{4}-81}{x^{4}-1} \cdot \frac{x^{2}+1}{x^{2}+9}$ A) $\frac{(x+3)(x-3)}{(x+1)(x-1)}$ B) $\frac{x+3}{x-1}$ C) $\frac{x-3}{x+1}$

Multiple Choice

Multiply and, if possible, simplify.
- $\frac{x^{4}-81}{x^{4}-1} \cdot \frac{x^{2}+1}{x^{2}+9}$

A) $\frac{(x+3) (x-3) }{(x+1) (x-1) }$
B) $\frac{x+3}{x-1}$
C) $\frac{x-3}{x+1}$
D) $\frac{x-3}{x-1}$