Question: When can the MM information procedure be invoked by the network?
Option 1: Only when a new GMM context is being established
Option 2: At any time during an established GMM context
Option 3: Only after a successful authentication procedure
Option 4: Only when the UE is in idle mode
Explanation: The MM information procedure can be invoked by the network at any time, as long as a GMM context has been established. This allows the network to provide or request information from the User Equipment (UE) as needed, without being limited to specific events or states.