(A) National Law
(B) ** Foreign Policy
(C) National Policy
(D) A Constitution
EXPLANATIONS BELOW
Concept note-1: -Diplomacy. Diplomacy is the act of dealing with other nations, usually through negotiation and discussion.
Concept note-2: -Foreign policy is often directed for the purpose of ensuring national security. Governments forming military alliances with foreign states in order to deter and show stronger resistance to attack. Foreign policy also focuses on combating adversarial states through soft power, international isolation, or war.
Concept note-3: -A country’s foreign policy (also called the international relations policy) is a set of goals about how the country will work with other countries economically, politically, socially and militarily. It includes such matters as international trade, foreign aid, military alliances, and war.
Concept note-4: -foreign policy, general objectives that guide the activities and relationships of one state in its interactions with other states. The development of foreign policy is influenced by domestic considerations, the policies or behaviour of other states, or plans to advance specific geopolitical designs.
Concept note-5: -Within the Executive Branch, the Department of State is the lead U.S. foreign affairs agency, and the Secretary of State is the President’s principal foreign policy adviser.