Explanation:

- Order 8, Rule 6D in the Code of Civil Procedure deals specifically with the effect of discontinuance of a suit. This rule addresses the consequences when a suit is either withdrawn or dismissed, especially when counterclaims are involved.

Answer: Option 2 - Order 8, Rule 6D

- Order 5, Rule 30 focuses on the service of summons and the procedure when the defendant refuses to accept the service.

- Order 6, Rule 10 pertains to the forms of pleading, emphasizing that documents should be precise and easily understandable.

- Order 10, Rule 22 is about examining parties with respect to allegations of fact in the pleadings of the suit.