In an ________, a document is encrypted using a secret key and sent with that secret key, encrypted via a public-key algorithm.

In a _________ system multiple users simultaneously access the system through terminals, with the OS interleaving the execution of each user program in a short burst or quantum of computation.

Fill in the blank(s) with the appropriate word(s).

You are attempting to use Remote Desktop from a Windows Vista computer to a Windows Server 2016 install, but are unable to do so. You have verified that other computers running newer versions of the Windows operating system on the same network are able to remote desktop to the server. What is most likely the issue?

A. The server has a firewall entry that prohibits older versions of Windows from using Remote Desktop with the server. B. Network Level Authentication is turned on in Remote Desktop settings. C. The Windows Vista Remote Desktop client must be updated. D. The Vista computer is not capable of using IPSec communication with Remote Desktop.