The Discussion of Federalism in the Chapter Contains a Distinction

The discussion of federalism in the chapter contains a distinction between de facto federalism and de jure federalism. The latter is referred to as "federalism in structure." To be classified as federal in structure, what features must a country have?

A) A unitary state.
B) Constitutionally regional governments that cannot be unilaterally abolished by the national government. Both the regional and the national government govern their own citizens directly, and both have independent bases of authority.
C) A bicameral legislature, in which legislative deliberations occur in two distinct assemblies.
D) devolution
E) all of these