Question: What happens to any active PDP (Packet Data Protocol) contexts when the UE's (User Equipment) Packet Domain service attachment state changes to detached using the `+CGATT` command?
Option 1: They are automatically updated to a new CID (Context Identifier).
Option 2: They remain active but are suspended until reattachment.
Option 3: They enter a pending state awaiting manual reactivation.
Option 4: They are automatically deactivated.
Explanation: According to the telecom concept of session management, when a UE detaches from the Packet Domain service, any active PDP contexts would logically need to be terminated to maintain network resource allocation integrity and prevent orphaned sessions. Thus, deactivation upon detachment is the most technically coherent outcome, ensuring network efficiency and preventing potential resource leaks.