The expression $$\frac{1}{{x - 1}} - $$$$\frac{1}{{x + 1}} - $$$$\frac{2}{{{x^2} + 1}} - $$$$\frac{4}{{{x^4} + 1}}$$is equal to = ?

• A. $\frac{8}{{{x^8} + 1}}$$
• B. $\frac{8}{{{x^8} - 1}}$$
• C. $\frac{8}{{{x^7} - 1}}$$
• D. $\frac{8}{{{x^7} + 1}}$$