Question: What action does a receiving side of an Acknowledged Mode (AM) Radio Link Control (RLC) entity take upon detecting loss of AM Dedicated (AMD) Protocol Data Units (PDUs) at lower layers?
Option 1: It discards the subsequent AMD PDUs to prevent congestion.
Option 2: It requests retransmissions from its peer AM RLC entity.
Option 3: It notifies the upper layer of the potential data corruption.
Option 4: It switches to Transparent Mode (TM) for the remainder of the session.
Explanation: In Acknowledged Mode (AM), reliability is ensured through acknowledgments and retransmissions. Upon detecting lost AMD PDUs, the receiving AM RLC entity must request retransmissions from its peer to ensure data integrity and completeness before delivering Reassembly Service Data Units (SDUs) to the upper layer. This action aligns with the AM mode's primary goal of providing a reliable data transfer service.