Discussion
An extent is which of the following?
Answer: C
Correct answer: The set of all instances of a class within a database
The extent is the collection the database maintains of every object of a class, and it is what queries range over - the object-oriented counterpart of a table holding the rows of one type. A class need not have an extent, but without one there is nothing for a query to select from and no key may be declared.
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