Which of the following statements regarding the International Court of Justice is wrong ?

International Court of Justice is the principal judicial organ of the United Nations.

The Statute of the International Court of Justice is based upon the Statute of the Permanent Court of International Justice (PCIJ).

All member States of the United Nations are ipso facto parties to the Statute of the Court.

Acceptance of the jurisdiction of the International Court of Justice is compulsory for all international disputes.