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 for base station communications?
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 type.
Option 3: All CMPv2 messages must consist of exactly one PKIMessage.
Option 4: The profile allows for the omission of PKIMessages in certain scenarios.
Explanation: This correct answer reflects a key structural requirement for CMPv2 messages within this specific profile. By mandating that all such messages consist of exactly one PKIMessage, the standard ensures consistency and predictability in how these messages are constructed and interpreted across the network, which is crucial for maintaining robust security and efficient communication between entities like base stations and Registration Authorities/ Certification Authorities (RA/CAs).