What Happens If a Nation Has Allowed a Case Against

What happens if a nation has allowed a case against it to be brought before the ICJ (International Court of Justice?

A) American Arbitration Association can be sought for justice.
B) UN Conference on International Trade Law can be approached.
C) International Chamber of Commerce will be another source for seeking justice.
D) European Court of Justice can be approached if the country is in the European Union.
E) The plaintiff nation can seek recourse through the UN Security Council.