Question: In E-UTRAN, which of the following scenarios utilizes the Early Status Transfer procedure for transferring COUNT for discarding already forwarded downlink SDUs during handover?
Option 1: Only during DAPS Handover between two eNBs in a single connectivity scenario
Option 2: During Conditional Handover in Dual Connectivity (from SeNB to MeNB) and also in EN-DC (from en-gNB to MeNB)
Option 3: Exclusively for PSCell Addition in SA (Single Connectivity) deployments
Option 4: Never during handovers, only for cell reselection procedures
Explanation: The correct answer is Option 2 because the Early Status Transfer procedure is utilized not only in single connectivity scenarios like DAPS Handover but also in more complex multi-connectivity scenarios. Specifically, it's used during Conditional Handovers in Dual Connectivity (from Secondary eNB to Master eNB) and in E-UTRA-NR Dual Connectivity (from next-generation NodeB to Master eNB), highlighting its importance across various handover types within advanced network architectures. This demonstrates a nuanced understanding of handover procedures in evolving telecom networks.