For SECRET and CONFIDENTIAL systems, agencies using infrared keyboards must not allow any of: (1) line of sight or reflected transmissions reaching an unsecure area; (2) several infrared keyboards of differing classifications in the same area; (3) other infrared devices being placed where they have line of sight to the keyboard or to its receiver or port; or (4) infrared keyboards being used in areas with unprotected windows.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.