Explanation:

- Understanding Department Interest in Industrial Relations:

- HR (Human Resources): Primarily responsible for maintaining employee relations and ensuring a harmonious workplace. They mediate between management and employees, handle grievances, and foster positive working conditions.

- Production: Focuses on manufacturing processes and output, less directly involved in relations.

- Finance: Concerns itself with financial health and reporting, not typically involved in day-to-day employee relations.

- Marketing: Engaged in promoting and selling products or services, with indirect interest in industrial relations.

- The correct answer is HR from Option 1.