Verify that the given differential equation is exact; then solve it. (4x + 2y)dx + (2x + 6y)dy = 0 Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. The equation is exact and an implicit solution in the form F(x,y) = C is = C, where C is an arbitrary constant. (Type an expression using x and y as the variables.) OB. The equation is not exact.