An administrator needs to securely troubleshoot an issue with a virtual host from a remote location. Which of the following allows for this by default?

A Virtual Private Network (VPN) establishes a secure, encrypted tunnel over a public network, allowing the administrator to connect to the internal network where the virtual host resides as if they were locally present. Remote Desktop Protocol (RDP) then provides a graphical interface to interact with the virtual host's operating system, enabling comprehensive troubleshooting from a remote location securely.

SCP (Secure Copy Protocol) is used for transferring files securely between hosts, and while RDP provides remote access, SCP does not provide the interactive session needed for troubleshooting an operating system's graphical interface.

AES (Advanced Encryption Standard) and TLS (Transport Layer Security) are cryptographic algorithms and protocols used to secure data in transit, but they are underlying security mechanisms, not direct tools or protocols for interactive remote access and troubleshooting of a virtual host.

SSL (Secure Sockets Layer) is an older encryption protocol, largely superseded by TLS, and SFTP (SSH File Transfer Protocol) is primarily for secure file transfer, not for providing an interactive remote desktop session for troubleshooting an operating host.