Question: Which entity typically triggers the establishment and modification of E-UTRAN resources for user data transport in relation to the E-RAB Service Management function?
Option 1: User Equipment (UE)
Option 2: Serving Gateway (S-GW)
Option 3: Packet Data Network Gateway (P-GW)
Option 4: Mobility Management Entity (MME)
Explanation: The Mobility Management Entity (MME) triggers the establishment and modification of E-UTRAN resources for user data transport, controlling and managing network resources based on Quality of Service (QoS) information for efficient allocation in active UE contexts within the eNB.