Question: In UTRAN Iub interface NBAP signalling, when a receiving node encounters an IE (Information Element) or IE group with unknown content, how does it determine the course of action, according to the Criticality Information specified for that IE/IE group?
Option 1: Based solely on the type of IE or IE group, disregarding the Criticality Information value.
Option 2: By consulting external configuration settings that override the Criticality Information.
Option 3: Through a predefined default action applied uniformly to all non-comprehended IEs/IE groups.
Option 4: According to the specific value of the Criticality Information (e.g., Reject IE, Ignore IE and Notify Sender, Ignore IE) assigned to that IE or IE group.
Explanation: The correct answer is Option 4 because the Criticality Information directly instructs the receiving node on how to handle non-comprehended IEs or IE groups, ensuring flexibility in response based on their designated criticality within the signalling protocol.