Which one of the following statements is correct? The concept of jus cogens is understood and applied…

peremptory norm of International Law to be developed at a future time

peremptory norm from which no derogation is permitted and which can be modified by a subsequent norm of general international law having the same character

long established rule of international law which cannot be violated

rule developed by the consent of signatory of treaties to set aside the rules laid down in the treaty