Question: What is the primary purpose of combining an RNC Identifier (RNC-Id) with a PLMN (Public Land Mobile Network) identifier in a UTRAN or GERAN Iu mode network?
Option 1: To enhance security for user data transmission
Option 2: To optimize handover procedures between different RNCs
Option 3: To globally identify the RNC within and across networks
Option 4: To manage Quality of Service (QoS) parameters for specific users
Explanation: Combining the RNC-Id with the PLMN identifier creates a unique global identifier for the RNC. This is crucial for distinguishing between RNCs not just within a network but also when interacting with other networks, ensuring clear identification and efficient communication across different network infrastructures, particularly in scenarios involving roaming or inter-network handovers.