The correct answer is: A. Highly intelligent
A highly intelligent CAD display configurability allows work without any host support. This means that the CAD system can be used without being connected to a computer. This can be useful in situations where there is no access to a computer, such as on a construction site or in a remote location.
A medium intelligence CAD display configurability requires a host computer to function. This means that the CAD system must be connected to a computer in order to be used. This is the most common type of CAD system.
A low intelligence CAD display configurability is the least intelligent type of CAD system. This type of system requires a host computer to function, and it also requires a lot of user input. This type of system is not commonly used.
A CAD display with no secondary storage capacity is not a true CAD system. This type of system can only display images that are stored on the host computer. This type of system is not commonly used.
In conclusion, the correct answer is: A. Highly intelligent.