Find a0 of the function \(f(x) = \frac{1}{4} (π-x)^2.\)

• A. \(\frac{π^2}{6} \)
• B. \(\frac{π^2}{12} \)
• C. \(5\frac{π^2}{6} \)
• D. \(5\frac{π^2}{12} \)