The correct answer is: C. Disk Operating System.
DOS is a family of operating systems that were popular in the 1980s and 1990s. It was originally developed by Microsoft for IBM PCs, but it was later ported to other platforms as well. DOS was a single-tasking operating system, which means that it could only run one program at a time. It was also a command-line operating system, which means that users had to type commands into a prompt to interact with the computer.
DOS was a popular operating system because it was simple to use and it was compatible with a wide range of hardware. However, it was eventually replaced by more advanced operating systems such as Windows and macOS.
Here is a brief explanation of each option:
- A. Data Out System: This is not a correct answer because DOS does not stand for “Data Out System.”
- B. Disk Out System: This is not a correct answer because DOS does not stand for “Disk Out System.”
- C. Disk Operating System: This is the correct answer because DOS stands for “Disk Operating System.”
- D. Data Operating System: This is not a correct answer because DOS does not stand for “Data Operating System.”