Text-based stimulus: A 2-by-2 four-panel diagram titled 'Cross Zone CNAME Resolution'. Panel A: Resolver assumes.org and.net are the same zone and skips the second lookup. Panel B: Resolver resolves login.example.org and receives CNAME login.idp.example.net from example.org DNS; resolver then follows DNS hierarchy for example.net; authoritative DNS for example.net returns A or AAAA for login.idp.example.net; resolver returns final IP to client. Panel C: TLD server converts the CNAME into an email MX record before returning an IP. Panel D: Browser sends the full password form to the root server to resolve the CNAME. Use the cross-zone CNAME diagrams. Which diagram correctly resolves login.example.org when it is a CNAME to login.idp.example.net?