Question: Which entity is responsible for determining the allocation/retention priority level of a Radio Access Bearer (RAB) based on factors like subscription information and QoS information?
Option 1: User Equipment (UE)
Option 2: UTRAN (Universal Terrestrial Radio Access Network)
Option 3: Core Network (CN)
Option 4: Serving GPRS Support Node (SGSN)
Explanation: The Core Network (CN) is responsible for determining the allocation/retention priority level of a RAB, as it has access to relevant information such as subscription details and QoS requirements. This determination is then communicated to the UTRAN, which handles the queuing, pre-emption, and priority handling based on the CN's directives. This division of responsibilities ensures efficient management of radio resources while adhering to the subscriber's agreed-upon service levels.