The answer is (a.) DOS
DOS stands for Disk Operating System. MS-DOS is the operating system which has a command interface similar to the command prompt of Windows 7 and Windows 8. Among the options, DOS is the only OS which is has a command line interface. Others have graphics.
Google c++ tutorial. Cplusplus and Tutorials Point both have some good resources
1. True
2. Usually true, but it depends on the search engine you're using. For example, Google lets you search for several words without commas.
Answer:
a feeling of smug or uncritical satisfaction with oneself or one's achievements.
Explanation:
