Question: How does a receiving RANAP entity handle an Abstract Syntax Error due to missing IEs or IE groups (Case 3) in a received message?
Option 1: Based solely on the Criticality information sent by the originator.
Option 2: Based solely on the Presence information for the missing IE/IE group specified in the receiver's version of the specification.
Option 3: By immediately rejecting the entire procedure without further processing.
Option 4: Based on both Criticality information and Presence information for the missing IE/IE group specified in the receiver's version of the specification.
Explanation: The correct handling of Case 3 (missing IEs or IE groups) involves considering both the Criticality of the missing elements, which indicates their importance to the message's understanding, and the Presence information, which defines whether those elements should have been present according to the specification version used by the receiver. This dual consideration ensures a balanced approach between maintaining protocol integrity and minimizing unnecessary disruptions to communication processes.