Question: What response does the Secondary Node B (SeNB) send to the Master Node B (MeNB) if it successfully modifies resources for a specific User Equipment (UE) during the MeNB initiated SeNB Modification Preparation procedure?
Option 1: SENB MODIFICATION REQUEST REJECT message
Option 2: SENB MODIFICATION REQUEST ACKNOWLEDGE message
Option 3: RESOURCE MODIFY FAILURE NOTIFICATION message
Option 4: UE RESOURCE UPDATE RESPONSE message
Explanation: Upon successful modification of resources for a specific UE at the SeNB, as per the MeNB's request in the MeNB initiated SeNB Modification Preparation procedure, the SeNB responds with an acknowledgement to confirm the success. This is crucial for the MeNB to understand the outcome of its resource modification request, ensuring seamless network operation and resource management. The correct response in this context is the SENB MODIFICATION REQUEST ACKNOWLEDGE message.