Which of the following protocols would allow for graphical access to Windows bastion hosts?

The correct answer is RDP because it is designed specifically for remote graphical access to Windows operating systems. RDP, which stands for Remote Desktop Protocol, enables users to connect to a system and interact with the desktop environment as if they were physically present at the computer. This capability is crucial for managing Windows bastion hosts, which are highly secured servers often used in cloud environments to minimize vulnerabilities and secure access.

In contrast, SSH (Secure Shell) is primarily used for secure command-line access to systems, typically on Linux or Unix hosts, and does not provide a graphical interface. DNS (Domain Name System) is used for resolving domain names to IP addresses and has no functionality related to direct access or control of hosts. HTTP (Hypertext Transfer Protocol) is used for transferring web content and does not provide a means for graphical remote access to desktop environments. Therefore, RDP is the appropriate choice for accessing Windows bastion hosts graphically.