What is the functional classification of administrative staff in the EU? option_A: Function groups: A, B, C and D according to salary level. option_B: Function groups: AD (Administrators), AST (Assistants) and AST/SC (Secretaries/Clerks). option_C: Function groups: FGI, FGII, FGIII and FGIV according to the level of responsibility. option_D: Function groups: Permanent, Contract, Temporary and Trainee. explanation: According to Article 5 of the EU Staff Regulation, positions are classified into three functional groups: AD (Administrators), AST (Assistants) and AST/SC (Secretaries/Clerks). This classification applies to permanent staff. Options B, C and D mention categories or classifications that do not correspond to the main functional classification of permanent staff according to the EU Staff Regulation.