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?

VPN establishes a secure, encrypted tunnel over an untrusted network, protecting all traffic between the remote administrator and the network. RDP (Remote Desktop Protocol) then provides a full graphical interface to the virtual host, enabling hands-on troubleshooting. Together, they fulfill both the security requirement and the interactive remote access requirement by default.

SCP (Secure Copy Protocol) is designed for file transfers only and does not provide an interactive remote desktop or troubleshooting capability on a virtual host.

AES and TLS are cryptographic algorithms and protocols used to encrypt data in transit, but they are not standalone remote access tools and do not by themselves allow an administrator to connect to and interact with a remote host.

SSL is an encryption protocol and SFTP (SSH File Transfer Protocol) is used for secure file transfers - neither provides the interactive remote desktop session needed for troubleshooting a virtual host.