Question: In the context of the Authentication Framework (AF) for Network Domain Security (NDS), what is a requirement for the structure of CMPv2 messages utilizing the PKIMessage profile as specified?
Option 1: The message may contain multiple PKIMessages, with a minimum of one.
Option 2: The size of the sequence for PKIMessages can vary based on the specific request or response.
Option 3: All CMPv2 messages must consist of exactly one PKIMessage, ensuring a fixed sequence size.
Option 4: The profile allows for optional inclusion of PKIMessages within CMPv2 messages.
Explanation: This correct answer reflects the requirement that all CMPv2 messages, as per the specified profile for PKIMessage in the context of NDS and AF, must strictly contain exactly one PKIMessage. This ensures consistency and predictability in message structure, which is crucial for secure authentication frameworks in telecom networks. The fixed sequence size of 1 simplifies processing and reduces potential vulnerabilities that could arise from variable or multiple message inclusions.