If $$\frac{a}{b} = \frac{{25}}{6}{\text{,}}$$then the value of $$\frac{{{a^2} - {b^2}}}{{{a^2} + {b^2}}}$$is?

• A. $\frac{{589}}{{651}}$$
• B. $\frac{{589}}{{661}}$$
• C. $\frac{{661}}{{589}}$$
• D. $\frac{{625}}{{36}}$$