Question: In a non-collocated LWA scenario, what is the primary function of the Xw-U interface between eNB and WT?
Option 1: To deliver control plane messages for UE mobility management
Option 2: To transfer user data (LWA PDUs) between eNB and WT for a UE
Option 3: To provide feedback from WT to eNB for radio resource allocation
Option 4: To support S1-U termination in the WT
Explanation: The Xw-U interface is used to deliver LWA PDUs (user data) between eNB and WT for a UE, as stated in the text. This interface supports flow control based on feedback from WT, but its primary function is to transfer user data.