Step 1: Understanding the Concept:
Cooperative marketing structures in India follow a traditional three-tier institutional hierarchy.
Step 2: Detailed Explanation:
1. Primary Cooperative Marketing Societies: Function at the primary village or taluka/mandi level.
2. Central District Cooperative Marketing Societies: Function at the district level.
3. State Cooperative Marketing Federation (Apex Level): Functions as the federation at the state level (e.g., MARKFED, HAFED).
National level bodies include NAFED.
Step 3: Final Answer:
Hence, the marketing federation exists at the State level.