Under International Law,what Is the Difference Between a Treaty and a Convention

Under international law,what is the difference between a treaty and a convention?

A) A treaty is an agreement, and a convention is typically the meeting at which the treaty was drafted.
B) The two terms have the same meaning; thus, there is no difference between them.
C) A treaty is an agreement negotiated directly be the signatory nations, while a convention is first drafted by a sponsoring international organization, after which nations can decide whether to be bound by it.
D) Conventions usually have only a few signatory nations, while treaties usually have many.
E) A convention is a treaty signed by at least four nations, while a treaty is signed by fewer than four nations.