Assign to each of the following differential equations the integrating factor/s (if there are any listed, multiple answers possible).

A) (1 + y^2)/x^2 + y′ = 0 I) μ = 1/(1 + y^2)

B) y/(4 + x) + y′ = 0 II) μ = 1/y

C) 1 + (1 + x)yy′ = 0 III) μ = 4 + x

A= I

B= III

C= II