Question: What transport mechanism is specified as supported for communications between UAVs (Unmanned Aerial Vehicles) within a geographical area, according to 3GPP standards for Uncrewed Aerial System (UAS) application layer support?
Option 1: Unicast Uu
Option 2: Multicast/Broadcast Uu
Option 3: Proximity Services (ProSe)
Option 4: Satellite Communication Link
Explanation: The correct answer is Option 1 because, according to 3GPP standards for UAS application layer support, unicast Uu is explicitly mentioned as a supported transport mechanism for communications between UAVs within a geographical area. In contrast, multicast/broadcast Uu and ProSe are noted as being out of scope, implying they are not currently supported or specified for this particular use case. Satellite Communication Link is not mentioned at all in relation to the supported mechanisms.