What is the most common tool used to restrict access to a computer system?

A. User logins

B. Passwords

C. Computer keys

D. Access-control software

Please do not use chat terms. Example: avoid using "grt" instead of "great".

You can do it
  1. Integrated Circuits (ICs) are related to which generation of computers?
  2. An optical input device that interprets pencil marks on paper media is
  3. Size of the primary memory of a PC ranges between
  4. Any type of storage that is used for holding information between steps in its processing is
  5. The organization and interconnection of the various components of a computer system is
  6. Which operation is not performed by computer
  7. The average time necessary for the correct sector of a disk to arrive at the read write head is _____
  8. Which of the following is valid statement?
  9. High density double sided floppy disks could store _____ of data
  10. Which of the following produces the best quality graphics reproduction?
  11. Which of the following terms is the most closely related to main memory?
  12. Which computer support co-processors?
  13. A computer consists of
  14. ________ computer is a medium sized computer
  15. Switching device of fifth generation computer is________
  16. The accuracy of the floating-point numbers representable in two 16-bit words of a computer is approximately
  17. Examples of output devices are
  18. Floppy disks typically in diameter
  19. ABC is a
  20. The computer size was very large in
  21. A device designed to read information encoded into a small plastic card is
  22. Circular division of disks to store and retrieve data are known as
  23. The first microprocessor built by the Intel corporation was called
  24. RAM can be treated as the ________ for the computer's processor
  25. In most of the IBM PCs, the CPU, the device drivers, memory, expansion slots and active components are…
  26. What is the number of read-write heads in the drive for a 9- trac magnetic tape?
  27. The least significant bit of the binary number, which is equivalent to any odd decimal number, is:
  28. Which is not a comptuer of first generation?
  29. BCD is
  30. In order to play and hear sound on a computer, one needs: