Arrange the following types of differential equations in terms of their complexity to solve, from least to most complex:
A) First-order linear differential equations
B) Second-order linear differential equations
C) Nonlinear first-order differential equations
D) Partial differential equations
1
A, B, C, D
2
A, C, B, D
3
A, B, D, C
4
C, A, B, D