An administrator cannot bring a monitor or keyboard into the datacenter while installing a new OS. What is the administrator MOST likely to use to configure the OS?

The most likely tool the administrator would use to configure the OS in the scenario described is Remote Desktop Protocol (RDP). RDP is a Microsoft protocol that enables users to connect to another computer over a network connection. It allows for remote access to the desktop interface of a server, facilitating tasks such as OS installation and configuration without the need for direct physical access to the machine.

In the context of this question, the inability to bring a monitor or keyboard into the datacenter implies that the administrator needs a method to interact with the server remotely. RDP would provide a convenient way to perform the necessary configurations as the administrator can control the server's graphical user interface from another computer.

The other options, while related to remote management, either do not primarily focus on desktop interaction (like Integrated Lights Out Manager, which is more hardware-level management) or do not necessarily represent the most straightforward solution for remote desktop access (like Virtual Network Computing, which does exist but is less commonly used than RDP in Windows environments). The Keyboard-Video-Mouse (KVM) solution, while it allows for monitoring and controlling of servers, typically requires physical access, which is not compatible with the restriction outlined in the scenario. Thus, RDP stands out as the best option