Explanation
EAP-TLS is the method that should be selected to meet the requirements for designing a new secure wireless network. EAP-TLS (Extensible Authentication Protocol - Transport Layer Security) is an authentication protocol that uses X.509 digital certificates for both clients and servers. It provides strong security and mutual authentication by using TLS encryption and public key cryptography. It does not use plaintext passwords or shared secrets that can be compromised or guessed. It is also an open standard that is vendor neutral and supported by most wireless devices1. References: https://www.securew2.com/blog/what-is-eap-tls 1

According to the CompTIA troubleshooting methodology1, testing the theory is the step where the network administrator verifies if the problem is caused by a specific factor or change. This step involves checking the system logs, running diagnostic tools, or performing other tests to confirm or eliminate the possible cause.
Reference:
Troubleshooting Methodology | IT Support and Help Desk | CompTIA1

The management plane is responsible for managing and controlling network devices. Let's evaluate the options:
Routing table: Part of the control plane, used for making forwarding decisions.
Current configuration: Part of the management plane. It includes settings, access control lists, and other configuration details.
File operations: Typically part of the management plane. It involves tasks like uploading/downloading configurations, firmware updates, and backups.
Console port: Also part of the management plane. It provides direct access to the device for configuration and troubleshooting.
Among the options, the one most closely associated with the management plane is the current configuration.

Explanation
The authentication method that this setup describes is SSO (Single Sign-On). SSO is a technique that allows a user to log in once to a main web application and then access multiple other applications or services without having to re-enter credentials. SSO simplifies the user experience and reduces the number of passwords to remember and manage. References: CompTIA Network+ N10-008 Certification Study Guide, page 371; The Official CompTIA Network+ Student Guide (Exam N10-008), page 14-5.