Question: What is the purpose of including the Protocol Configuration Options IE in a message?
Option 1: To establish a new PDN connection.
Option 2: To transmit protocol data end-to-end for the PDN connection, such as configuration parameters or error codes.
Option 3: To release an existing PDN connection.
Option 4: To modify the QoS parameters of a PDN connection.
Explanation: The Protocol Configuration Options IE is included in a message to transmit protocol data end-to-end for the PDN connection, allowing the MS to send configuration parameters, error codes, or messages/events to the network. This enables the exchange of information necessary for the proper functioning of the PDN connection.