Which of the following is a correct statement about customary international law $($CIL$)?$

Question $6$Answer

A$.$

It must be written and ratified to become binding.

B$.$

It is considered secondary to treaties in international law.

C$.$

It pertains only to trade regulations.

D$.$

It does not require ratification to become binding.

E$.$

It is always governed by international organizations.