Simplify
- $\frac{\frac{1}{a}+1}{\frac{1}{a}-1}$ A) $1-a^{2}$ B) 1
C) $\frac{a}{1-a^{2}}$ D) $\frac{1+a}{1-a}$

Multiple Choice

Simplify.
- $\frac{\frac{1}{a}+1}{\frac{1}{a}-1}$

A) $1-a^{2}$
B) 1
C) $\frac{a}{1-a^{2}}$
D) $\frac{1+a}{1-a}$