Software B. keyboard, mouse C. applications D. OSI

  An operating system (sometimes abbreviated as "OS") is the program that, after being initially   (1)   into the computer by a   (2)   program, manages all the other programs in a computer. The other programs are called   (3)   or application programs. The application programs make   (4)  of the operating system by making  (5)  for services through a  (6)  application program interface (API). In addition, users can  (7) directly with the operating system (8) a user interface such as a (9) language or a (10) user interface (GUI).

  4. In computer data processing, a record is a collection of data items arranged for processing by a program. 

  5. Computer software needs to be loaded into the computer’s memory. Once the software is loaded, the computer is able to execute the software. 

  6. A multi-user operating system allows many users to use the computer’s resources simultaneously. 

  7. WAN technologies generally function at the lower three layers of the OSI reference model: the physical layer, the data link layer, and the network layer. 

  8. One solution to major security problem is patches, which are frequently installed to fix known security holes. 

  9. In C language, a string is a series of characters enclosed in double quotes. 

  10. The operating systems designed for being used in embedded computer systems are known as embedded operating systems. 

  11. Portability means that a program written for one computer system can be compiled and run on another system with little or no modification. 

  12. In C language, a string is a series of characters enclosed in double quotes.