Question: What is the correct format for encoding a TWAN (Trusted Non-3GPP Access Network) Operator Name, according to 3GPP specifications?
Option 1: A sequence of numbers separated by slashes (e.g., 123/456)
Option 2: An Internet Protocol (IP) address in dotted decimal format
Option 3: A single alphanumeric string without separators (e.g., operatorname)
Option 4: A realm in the form of an Internet domain name, with one or more labels separated by dots (e.g., operator.com)
Explanation: The correct answer is Option 4 because, according to the specifications, a TWAN Operator Name must be encoded as a realm in the format of an Internet domain name. This means it should resemble typical website addresses, with one or more labels (comprising alphabetic characters, digits, and hyphens) separated by dots. This format is crucial for identifying the TWAN operator when the network is not operated by a mobile operator, ensuring compatibility and clarity in telecommunications networks.