Cho hàm số \(f\left( x \right) = \left\{ \begin{array}{l}\frac{{\sqrt {x + 4} - 1}}{{x - 1}}\,\,\,khi\,\,\,x > 4\\3 - x\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,khi\,\,\,\,x \le 4\end{array} \right..\) Tính f (5) + f (–5).
A.\( - \frac{3}{2}\)
B.\(\frac{{15}}{2}\)
C.\(\frac{{17}}{2}\)
D.\(-\frac{{5}}{2}\)