Final answer:
The court looks at legal definitions, EU tariff product definitions, Codex standards, and MS rules to determine if there is a substantial difference between regular yogurt and deep frozen yogurt.
Step-by-step explanation:
The key characteristics that the court looks at to determine if there is a substantial difference between regular yogurt and deep frozen yogurt include legal definitions of the products, EU tariff product definitions, Codex standards, and MS (Member States) rules. These factors help establish the parameters and criteria for distinguishing between the two types of yogurt.
Legal definitions refer to the official definitions of regular and deep frozen yogurt under relevant laws. EU tariff product definitions are the classifications of yogurt for import/export purposes within the European Union. Codex standards are internationally recognized food safety and quality standards, which may provide specific requirements for yogurt. MS rules are the regulations and guidelines set by individual Member States within the EU to ensure compliance with their specific standards and requirements.
Therefore, the correct answer is All of the above.