Step 1: Understanding the Concept:
International agricultural classification criteria (FAO mixed farming definitions) and global veterinary governance institutions (WOAH OIE headquarters).
Step 2: Detailed Explanation:
1. Statement I: According to the Food and Agriculture Organization (FAO) global livestock farming systems classification (Sere and Steinfeld): a Mixed Farming System is defined as a farming system in which more than 10% (or $> 20\%$ in operational subcategories) of the total value of agricultural production comes from non-livestock farming activities (crops), integrating crop cultivation with livestock rearing. Hence, Statement I is true.
2. Statement II: The World Organisation for Animal Health (WOAH), historically known as the OIE (Office International des Ɖpizooties, established 1924), has its official world headquarters located in Paris, France. Hence, Statement II is true.
Step 3: Final Answer:
Hence, Both Statement I and Statement II are true, matching option (A).