Question: What does the "Iu Transport Association" element primarily facilitate for both CS and PS domains in UTRAN's Iu interface RANAP signalling?
Option 1: Dynamic allocation of radio resources for handover procedures
Option 2: Association between Radio Access Bearer (RAB) and its corresponding transport bearer
Option 3: Authentication of User Equipment (UE) across different network domains
Option 4: Prioritization of traffic for Quality of Service (QoS) management
Explanation: The correct answer, "Association between Radio Access Bearer (RAB) and its corresponding transport bearer", reflects the element's purpose as described. This association is crucial for efficient data transfer, ensuring that each RAB (defining how data is transported over the radio interface) is correctly linked with its designated transport bearer (managing the data's path through the network). This facilitates seamless communication in both Circuit Switched (CS) and Packet Switched (PS) domains.