Object Oriented Database
A relationship should be specified how in the ODL?

Neither direction
One direction starting with the first class
One direction starting with the second class
Both directions

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Object Oriented Database
An extent is which of the following?

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

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