Consider the following differential equations: dy du df III) = 3x + 4 dx I) dx 2x I) dt + 3 a) I, II and III are non-homogeneous linear differential equations. b) Only I and II are non-homogeneous linear differential equations. c) Only I and III are non-homogeneous linear differential equations. d) Only II and III are non-homogeneous linear differential equations. e) Only III is a non-homogeneous linear differential equation.