Question: When is the Access Point Name Information Element (IE) included in a message by the User Equipment (UE)?
Option 1: Always, regardless of the request type.
Option 2: Only when the UE is requesting network connectivity for non-emergency services.
Option 3: Only when the PDN CONNECTIVITY REQUEST message is not included in an ATTACH REQUEST message and the request type does not indicate "emergency", "handover of emergency bearer services" or "RLOS".
Option 4: Never, as it is not a mandatory IE.
Explanation: The Access Point Name IE is included by the UE when it wishes to request network connectivity as defined by a certain access point name, but only under specific conditions. These conditions exclude emergency or handover of emergency bearer services scenarios, and also exclude cases where the PDN CONNECTIVITY REQUEST message is part of an ATTACH REQUEST message.