What Distinguishes Executive Agreements from Other Forms of Unilateral Directives

What distinguishes executive agreements from other forms of unilateral directives at the president's disposal?

A) They provide presidents with an alternative to the treaty-making process and a way to bypass legislative oversight.
B) They are counterparts to legislation and provide presidents with an alternative to the constitutional amendment process.
C) They are classified on issuance and thus avoid the scrutiny of Congress and interest groups.
D) They almost always target individuals and groups outside the government, rather than being directed to officials within the government.