Question: In the context of Uncrewed Aerial System (UAS) registration, what is the primary purpose of the UAE server's action in step 2 of the registration procedure?
Option 1: To assign a unique UAV ID to the UAV/UAV-C.
Option 2: To update the UAS application specific server (e.g., USS/UTM) with the UAE client's details.
Option 3: To verify the UAE client's support for required UAS features.
Option 4: To perform authentication and authorization check based on pre-provisioned security information or by interacting with a UAS application specific server.
Explanation: The correct answer is Option 4 because the primary purpose of the UAE server's action at this stage is to validate the identity and permissions of the UAE client, ensuring only authorized UAVs/UAV-Cs can access UAS services for security and compliance.