Question: How does a GTP-C entity determine whether to include critical optional parameters in an instance of Overload Control Information (OCI) IE when sending it to a receiver?
Option 1: The sender always includes all available parameters, regardless of the receiver's capabilities.
Option 2: The sender only includes critical optional parameters if it has knowledge of the receiver's capability to support them, either through signalling methods or configuration.
Option 3: The sender includes critical optional parameters randomly, to test the receiver's ability to handle unknown parameters.
Option 4: The sender never includes critical optional parameters, to avoid overwhelming the receiver with too much information.
Explanation: The correct answer is Option 2 because, according to the text, the sender shall only include one or more critical optional parameter(s) in any instance of Overload Control Information towards a receiver if the corresponding receiver is known to support these parameter(s). This ensures that the receiver can correctly comprehend the instance of the Overload Control Information containing one or more of these parameters.