Code of diplomatic etiquette and precedence
A. Statesmanship
B. Formalism
C. HierarchyD. Protocol

the official procedure or system of rules governing affairs of state or diplomatic occasions, Code of diplomatic etiquette and precedence is termed as Protocol. It may also refer to an international agreement that supplements or amends a treaty. Office protocol is attitudes, etiquette rules and guidelines for behavior that encompass the best way to act at work.