If P \(\frac{{{x^3} + {y^3}}}{{{{\left( {x - y} \right)}^2} + 3xy}},\;Q = \frac{{{{\left( {x + y} \right)}^2} - 3xy}}{{{x^3} - {y^3}}}\) and R \( = \frac{{{{\left( {x + y} \right)}^2} + {{\left( {x - y} \right)}^2}}}{{{x^2} - {y^2}}}\), then what is the value of(P ÷ Q) × R?

• A. 2(x2 + y2)
• B. x2 + y2
• C. 2xy
• D. 4xy