help with discussion question about network security

Please provide answer under the question apa format and provide references. Read the question carefully and answer completely. This is NOT a paper!!!!

1. Define what CIA stands for. Discuss the importance of each component of CIA to the business, and to IT personnel.
2. What is the Principle of Least Privilege? How would the PoLP increase security and decrease system/network vulnerability?
3. What is the historical basis for defense in depth (DiD)?
4. How do we expect DiD will protect cyber systems? List and discuss one vulnerability of DiD with respect to defending cyber systems.

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