Which document does not need to be served under Rule 5?

The correct answer is that a written motion that may be heard ex parte does not need to be served under Rule 5. When a motion is intended to be heard ex parte, it indicates that the party filing the motion is seeking relief or action without the presence or participation of the other party. Typically, these types of motions are made in situations where immediate action is needed, and notifying the other party in advance could affect the outcome of the request.

In contrast, documents such as an order stating that service is required, a discovery document, and a notice of settlement all fall under the requirements of Rule 5 for service. Rule 5 focuses on providing notice to involved parties about motions, orders, and other proceedings to ensure fairness in the legal process. Each of these documents is significant to the parties' interests in the case, necessitating proper service to keep all parties informed and allow them the opportunity to respond or participate accordingly.