Ten Windows Server machines are in a workgroup and you must encrypt all network traffic between them with the strongest security. Which authentication method should a connection security rule use?

Computer certificates provide the strongest authentication for connection security rules in a workgroup environment. Each server can have a unique certificate, ensuring mutual authentication and strong encryption for all network traffic. NTLMv2 is an older authentication protocol, primarily for backward compatibility, and is not as secure as certificates. Pre-shared keys (PSKs) are less scalable and harder to manage securely across ten machines; if one key is compromised, all connections are at risk. Kerberos V5 is a robust authentication protocol but requires a domain controller, which is not present in a workgroup.