Question: In E-UTRA connected to 5GC (excluding NB-IoT), which Layer 2 sublayer is responsible for offering 'data radio bearers' to the SDAP sublayer and 'signalling radio bearers' to the RRC sublayer?
Option 1: Medium Access Control (MAC) Sublayer
Option 2: Radio Link Control (RLC) Sublayer
Option 3: NR Packet Data Convergence Protocol (PDCP) Sublayer
Option 4: Service Data Adaptation Protocol (SDAP) Sublayer
Explanation: The correct answer is the NR PDCP sublayer because, in the layer 2 architecture for E-UTRA connected to 5GC (excluding NB-IoT), the NR PDCP sublayer offers 'data radio bearers' to the SDAP sublayer and 'signalling radio bearers' to the RRC sublayer, highlighting its role in converging packet data for both user plane (data radio bearers) and control plane (signalling radio bearers) in the 5G Core Network context.