If \(x = \frac{{\sqrt 5 - \sqrt 3 }}{{\sqrt 5 + \sqrt 3 }}\) and y is reciprocal of x, then what is the value of \(\sqrt {\left( {{x^3} + {y^3}} \right)} ?\)

• A. 3√122
• B. 5√122
• C. √122
• D. 2√122