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) Conventions usually have only a few signatory nations, whereas treaties usually have
many.
C) The two terms have the same meaning, thus there is no difference between them.
D) A treaty is an agreement negotiated directly be the signatory nations, whereas a
convention is first drafted by a sponsoring international organization, after which, nations
can decided whether to be bound by it.

D