Unfair competition includes advertisement and sales methods that violate the rule of good faith, inducement breach or termination of contract, unauthorized utilization of others’ business products, revealing production and business secrets unlawfully, not complying with general business conditions, and using general business terms and conditions that violate the rule of good faith. Therefore, the cases provided in the first four options are examples of unfair competition. However, under normal circumstances, advertising on social media does not constitute unfair competition.

The correct answer is E.