Question: What does the PDN type information element indicate about the UE's IP stack?
Option 1: The maximum number of simultaneous connections supported by the UE.
Option 2: The UE's capability to support multiple APNs.
Option 3: The IP version capability (e.g., IPv4, IPv6) of the IP stack associated with the UE.
Option 4: The UE's preferred QoS parameters.
Explanation: The PDN type information element is used to indicate the IP version capability of the IP stack associated with the UE. This allows the network to determine the UE's capabilities and configure the session accordingly.