Question: What happens when a NAS message is received with insufficient length to contain a complete message type information element?
Option 1: The message is processed, but the missing information is assumed to be default values.
Option 2: The message is ignored and no further action is taken.
Option 3: An error message is sent back to the sender indicating the issue with the received message.
Option 4: The message is stored for later processing when more information becomes available.
Explanation: According to the NAS protocol, if a message is too short to contain complete message type information, it shall be ignored. This ensures that incomplete or malformed messages do not cause issues in the network.