Question: What is the primary purpose of including the "Facility" information element in a message?
Option 1: To provide additional security features
Option 2: For the functional operation of supplementary services
Option 3: To support international roaming
Option 4: To enable Quality of Service (QoS) guarantees
Explanation: The "Facility" information element is included in messages to facilitate the proper functioning of supplementary services, which are value-added features that enhance the basic call functionality.