Which of the following is equivalent to 1−1x21−1x\frac{1 - \frac{1}{x^2}}{1 - \frac{1}{x}}1−x11−x21?
1−1x1 - \frac{1}{x}1−x1
1+1x1 + \frac{1}{x}1+x1
x−1x-1x−1
x+1x+1x+1