Object Oriented Database
Using OQL, you may do which of the following?

Return an entire collection of elements including duplicates.
All of these
Return a collection of elements without duplicates.
Return a specific subset of elements using a given criteria.

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Object Oriented Database
Which of the following is true concerning the following statement: class Manager extends Employee

Manager is a concrete class and a subclass.
Manager is an abstract class and a superclass.
Manager is an abstract class and a subclass.
Manager is a concrete class and a superclass.

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