Question: What action does the Secondary eNodeB (SeNB) take if it receives a SENB ADDITION REQUEST message with multiple E-RAB ID IEs set to the same value in the E-RABs To Be Added List IE?
Option 1: The SeNB sends a SENB ADDITION REQUEST ACKNOWLEDGE message with an error indication.
Option 2: The SeNB considers the establishment of the corresponding E-RAB as failed.
Option 3: The SeNB initiates a SeNB Release procedure immediately.
Option 4: The SeNB requests additional information via a SENB ADDITION REQUEST REJECT message.
Explanation: According to the specified behavior for abnormal conditions, if the SeNB receives a SENB ADDITION REQUEST with duplicate E-RAB ID IEs, it will consider the establishment of the corresponding E-RAB as failed. This ensures consistency and prevents potential conflicts in resource allocation or configuration.