Explanation:

- Order 9 Rule 13: This rule allows a defendant against whom an ex-parte decree has been passed to apply to the court that passed the decree to set it aside, if they can show sufficient cause for their absence.

- Order 47 Rule 1: This rule deals with the review of a judgment by the same court on grounds of an error on the face of the record, new important evidence, or other sufficient reasons. It is not specifically for ex-parte decrees.

- Section 96(2): This section of the Civil Procedure Code provides the right to appeal against an ex-parte decree. It allows a defendant to challenge the decree in a higher court.

- None of the above: This option is irrelevant, given the above options.

Correct Answer: Section 96(2)