Which statements about the international arbitration are correct?

A、Arbitration is a procedure for the settlement of disputes between states by a binding of award on the basis of law.
B、State may express consent to arbitration in certain treaties or in certain provisions of general treatise under which the parties agree to submit certain disputes between them to arbitration.
C、States are not obliged to send a dispute to arbitration even if they do make consent to arbitration.
D、States are obliged to send a dispute to arbitration if they have expressed consent to arbitration.