Question: What is the primary purpose of the ProSe UE ID in a Public Safety UE, and what is its format?
Option 1: Identifies the IP address for ProSe direct communication; Format: Variable-length character string
Option 2: Authenticates the UE for cellular network access; Format: 16-bit hexadecimal value
Option 3: Represents the UE's IMSI for billing purposes; Format: 15-digit numerical value
Option 4: Identifies the link layer address for ProSe direct communication; Format: 24-bit bit string
Explanation: The ProSe UE ID identifies the link layer address specifically for Proximity-based Services (ProSe) direct communication in Public Safety UEs, enabling device-to-device communications without relying on cellular network infrastructure. The standardized 24-bit bit string format ensures efficient processing and compatibility across ProSe-enabled devices.