An integrating factor`f(x)` is found for the linear differential equation `(1 + x^2)(dy)/(dx) + xy = 0 `and the equation is rewritten as `d/(dx)(I(x)y)=0`. Which of the following options is correct?

Options

A. `I(x) = e^(x^(2//2))`
B. `I(x) = sqrt(1 + x^2)`
C. `I(x) = 1 + x^2`
D. It is not possible to find such a function `I(x)`