You have to ask you teacher to show you which ones you got wrong and the answers to them.
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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.
Information that indicates ground air or navy force levels or dispositions is <u>confidential</u> security.
Security for a country's higher organizations is essential for a nation's protection.
Serious information like the nuclear organizations, army, navy, and ground air is at a higher risk for threats and hence requires higher security.
The information in such higher organizations is kept confidential and no third person is allowed access to the code of conduct of such organizations.
If information is leaked from the ground air or from navy force levels then there can be serious consequences for it. Hence, such information is always kept under confidential security.
To learn more about security, click here:
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