Question: What triggers the derivation of new NAS keys from a new KASME in a 3GPP SAE network, according to security architecture specifications?
Option 1: Periodic timer expiration for key refresh in the User Equipment (UE)
Option 2: Handover from E-UTRAN (4G) to UTRAN (3G) without an ongoing AKA process
Option 3: Successful completion of an Authentication and Key Agreement (AKA) process
Option 4: Receipt of a NAS SMC procedure initiation message from the Serving Gateway
Explanation: The correct answer is Option 3 because, as per the security architecture defined for 3GPP System Architecture Evolution (SAE), new NAS keys are derived from a new KASME after an Authentication and Key Agreement (AKA) process has successfully taken place, enhancing network security with updated security contexts and fresh keys.