Question: What is the primary purpose of binding the KSEAF to the serving network during primary authentication and key agreement procedures in a 5G system?
Option 1: To provide implicit serving network authentication to the UE, preventing one serving network from claiming to be another.
Option 2: To ensure that the anchor key is specific to the access network technology used by the UE.
Option 3: To enable the serving network to claim to be a different serving network for security purposes.
Option 4: To make the KSEAF cryptographically dependent on the key KASME delivered from the home network.
Explanation: The correct answer is Option 1 because binding the KSEAF to the serving network provides implicit serving network authentication to the UE, ensuring that one serving network cannot claim to be another. This is a critical security feature in 5G systems, as it prevents impersonation attacks and ensures the integrity of the serving network.