Question: What action does the Secondary eNodeB (SeNB) take when it receives a SENB RELEASE REQUEST message referencing a non-existent context?
Option 1: The SeNB sends an error indication to the Master eNodeB (MeNB) requesting clarification.
Option 2: The SeNB ignores the message.
Option 3: The SeNB initiates a new setup procedure for the referenced context.
Option 4: The SeNB releases all resources associated with the UE in question.
Explanation: According to standard procedures for handling abnormal conditions in E-UTRAN's X2 Application Protocol, if a SENB RELEASE REQUEST message refers to a context that does not exist on the Secondary eNodeB (SeNB), the SeNB is instructed to ignore the message. This ensures operational stability and prevents unnecessary resource allocation or deallocation based on invalid requests.