Which of the Following Is a Characteristic of a Confederal

Which of the following is a characteristic of a confederal system?

A) It is a system in which a subnational government is a "creature of the national government."
B) It is joined together by a central government that has unlimited powers over it.
C) It is a system in which the Constitution vests all powers in the national government.
D) It has a system of shared sovereignty where the powers are divided between a central and regional government.
E) It has a national government that exists and operates only at the direction of subnational governments.