Exam 220-1202 Topic 1 Question 198 Discussion

Because the employee needs graphical interface (GUI) access to Linux servers, the best option is VNC (Virtual Network Computing). VNC is specifically designed for remote control and sharing of desktops, meaning it can present the full graphical desktop of the Linux server to the remote user and allow interaction as if they were sitting at the machine. Quentin Docter describes VNC as "a remote control tool for the sharing of desktops," typically using TCP port 5900, and notes it is similar to RDP but is an open-source protocol; it can support encryption via plug-ins (important for secure remote use). Mike Meyers' Lab Manual reinforces the key distinction: SSH provides command-line access, but "when you need remote access to the full graphical desktop, you need a remote desktop application," and many of those use VNC (or RDP).
By contrast, SSH and Telnet are primarily text-console tools (Telnet is also unencrypted/insecure), and WinRM is Windows-focused remote management rather than the standard way to provide GUI access to Linux desktops.
References: Quentin Docter - CompTIA A+ Complete Study Guide (VNC remote desktop sharing; Telnet vs SSH); Travis Everett & Andrew Hutz - CompTIA A+ All-in-One Exam Guide (VNC as remote desktop tech); Mark Soper - Mike Meyers' A+ Lab Manual (GUI remote desktop requires VNC/RDP; SSH is CLI).