Which departures need to be coordinated with the next sector before issuing a clearance?

The correct answer highlights that certain departures, specifically those going directly into sector 12/65, require coordination with the next sector before issuing a clearance. This is important because sectors have specific airspace management protocols, especially when traffic is significant or when the departure is being handed off to a different sector right away. Coordinating these departures ensures that there is no conflict in airspace and that the receiving sector is aware of the incoming traffic, which helps maintain safety and efficiency in operations.

The other options do not encompass the same level of requirement for coordination. For instance, departures with no filed flight plan may refer to flights that aren't formally on the radar for air traffic control, but coordination still might not be mandatory based solely on that factor. Departures under 10,000 feet might also not require coordination if they remain within a sector's control unless they plan to enter a new sector's airspace. As for all departures, while it may be beneficial to communicate about them generally, not all scenarios necessitate such coordination. In conclusion, recognizing the specific requirement regarding departures into certain sectors underscores the importance of maintaining effective communication and operational safety within air traffic environments.