Diplomacy means the conduct of affairs between states by official agents through peaceful means with several ends in mind: 

First, it facilitates communication between political leaders or states and other entities of world politics. 

Second, it facilitates the negotiation of agreements. 

Third, it serves to gather intelligence or information from host countries. 

Fourth, it minimizes the effects of frictions in international relations. 

Fifth, it symbolizes the concrete existence of international society.

Therefore, among the given information, Number IV is wrong, others are correct.