Explanation:

- Order 7, Rule 3: Deals with the description of immovable property when necessary in a legal decree.

- Order 5, Rule 7: Pertains to the language of the summons when the defendant is to appear and answer.

- Order 6, Rule 10: Concerns the submission of pleadings, specifically the signature and verification of statements in civil proceedings.

- Order 4, Rule 8: Doesn't pertain to the summons or production of documents by the defendant; focuses on jurisdiction and powers.

The correct rule involves summons and document production. While your answer fits what you asked, Order 5, Rule 7 doesn’t deal with ordering defendants to produce documents; none in the given options directly match that context.