Question: What is the primary purpose of the ProSe UE ID in a Public Safety UE?
Option 1: To identify the link layer address used for ProSe direct communication.
Option 2: To authenticate the user equipment in a cellular network.
Option 3: To prioritize emergency services traffic in a congested network.
Option 4: To encrypt data transmitted over a proximity-based service.
Explanation: The ProSe UE ID is used to identify the link layer address used for ProSe direct communication by a ProSe-enabled Public Safety UE, as specified in 3GPP TS 23.303. This allows for efficient and secure communication between public safety devices in proximity-based services.