Answer:
C. Modern Programming Language Skills
Explanation:
A cisco develops, manufactures and sells networking hardware, software, telecommunications equipment and other high-technology services and products. ... They pioneered the concept of a local area network (LAN) being used to connect geographically disparate computers over a multiprotocol router system.
Hope that helps.
The operating system is what allows the user to interact with the computer's hardware. It has basic services such as accepting commands from the user, managing, loading, and executing programs, and managing hardware resources. Some examples of operating systems are Windows, Linux, Mac OSX, and IOS.
Application software are pieces of software that perform specific tasks such as word processors.