Discussion
A reason for using an SQL view to hide columns is:
Answer: C
Correct answer: to accomplish both of the above.
The same mechanism serves both purposes. Omitting columns a user does not need makes the result easier to read and to work with, and omitting columns a user should not see keeps salaries or identifiers out of reach. The user is granted rights on the view and none on the underlying table, so the restriction cannot be circumvented.
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