Object Oriented Database
An extent is which of the following?

Only one instance of a class within a database
A keyword that indicates that the subclass inherits from a superclass
The set of all instances of a class within a database
A keyword that indicates that the superclass inherits from a subclass

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

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

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