Simplify the expression n2−14n+49n2−49\frac{n^2 - 14n + 49}{n^2 - 49}n2−49n2−14n+49 completely.
n−7n+7\frac{n-7}{n+7}n+7n−7
n+7n−7\frac{n+7}{n-7}n−7n+7
n−7n−7\frac{n-7}{n-7}n−7n−7
n+7n+7\frac{n+7}{n+7}n+7n+7