Explanation:

- Order 9, Rule 6: This deals with the procedure when only the plaintiff appears in court. If the defendant doesn’t appear, the court may proceed ex parte, meaning in the absence of the defendant.

Correct Answer

- Order 5, Rule 30: It pertains to the service of summons and the steps to be taken if the summons is returned.

- Order 4, Rule 13: This order is about the procedure related to the institution of suits and the necessary details for the plaint.

- Order 6, Rule 10: It involves pleadings in a suit and the provisions related to amendments of such pleadings.