Windows updates need to be performed on a department's servers. Which of the following methods should be used to connect to the server?

FTP (File Transfer Protocol) is used for transferring files between computers and does not provide a remote graphical interface or command line access needed to perform Windows updates.

MSRA (Microsoft Remote Assistance) is a feature for inviting someone to help troubleshoot your computer remotely, but it's typically used for end-user support, not for routine server administration like performing updates.

Remote Desktop Protocol (RDP) provides a graphical interface connection to a Windows server, allowing administrators to interact with the server's desktop remotely. This is the standard and most efficient method for performing administrative tasks like installing Windows updates, as it enables full control over the server's operating system, including the update interface.

A VPN (Virtual Private Network) provides a secure network connection over a public network; while it might be used to establish secure connectivity to the server's network, it is not the direct protocol used for accessing the server's operating system interface to perform updates.