Show that the differential equation ydx + (2xy - e^(-2y))dy = 0 is not exact. Find an integrating factor to make it exact. Solve the equation.

Which of the following is the correct statement regarding the given differential equation?

A) The equation is exact.
B) The equation is not exact.
C) The equation can be made exact by finding an integrating factor.
D) The equation cannot be made exact by finding an integrating factor.