Question: What is the primary purpose of the "prach-Enhancements-r14" field in UE radio access capabilities, specifically regarding random access preambles in high-speed scenarios?
Option 1: To indicate UE support for restricted set type B preambles, as specified in E-UTRA physical channels and modulation standards.
Option 2: To enable UE transmission power control for better cell coverage in low-speed environments.
Option 3: To define the maximum number of preamble retransmissions in congested networks.
Option 4: To activate enhanced security protocols for initial access in sensitive areas.
Explanation: The "prach-Enhancements-r14" field's primary purpose is to signal UE support for a specific type of random access preamble (restricted set type B) optimized for high-speed scenarios, crucial for efficient radio resource management and reliable connectivity under various mobility conditions.