Which statements about the independence or sovereignty as following are correct?

A、Unless a state is formally forced to submit to the demands of a superior state, it can be considered as independent.;

B、A sovereign state is independent despite its political or economic dependence upon other states.;

C、Any treaty obligations or customary rules of international law are not to deprive the independent status of a state.;

D、Independence is an integral character of statehood and the independence of any state is not to be compromised by any other state.