Question: In an E-UTRAN, which entity sends the RESOURCE STATUS RESPONSE message to confirm successful initiation of a requested measurement for one or more measurement objects?
Option 1: MME (Mobility Management Entity) to Serving Gateway
Option 2: eNB2 (eNodeB2) to eNB1 (eNodeB1)
Option 3: UE (User Equipment) to Serving eNodeB
Option 4: Serving Gateway to PDN Gateway
Explanation: The RESOURCE STATUS RESPONSE message is specifically related to direct communication between two eNodeBs. Given that this message responds to a measurement request from one eNodeB to another, it aligns with eNB2 responding to eNB1 regarding the status of requested measurements, crucial for coordinated radio resource management and handover decisions.