Which of the following is a subsidiary source of International law according to Article 38(1) of ICJ statute?

Teachings of most highly qualified Publicists

The correct answer is Option (4) → Teachings of most highly qualified Publicists

The most authoritative source of international law is Article 38(1) of the Statute of the International Court of Justice, which provides that when a court which deals with disputes relating to international law, it shall apply:

"International conventions, whether general or particular, establishing rules expressly recognized by the contesting states,

a) International custom, as evidence of general practice accepted by law

b) The general principles of law recognized by civilized nations

c) Subject to provisions of Article 59, judicial decisions and teachings of the most highly qualified publicists of the various nations, as subsidiary means for the determination of rules of international law