Which of the following statement on the view concept in SQL is invalid?

A. All views are not updateable

B. The views may be referenced in an SQL statement whenever tables are referenced.

C. The views are instantiated at the time they are referenced and not when they are defined.

D. The definition of a view should not have GROUP BY clause in it.

You can do it
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    If both the functional dependencies : XY and YX hold for two attributes X and Y then the relationship between X and Y is
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