What is the solution of the equation(y + x(√xy)(x + y))dx – (y + y(√xy)(x + y))dy = 0?

• A. x2 + y2 = 2tan-1(√(y/x)) + c
• B. x2 + y2 = 4tan-1(√(y/x)) + c
• C. x2 + y2 = tan-1(√(y/x)) + c
• D. x2 + y2 = 2tan-1(√(x/y)) + c