A Classgroup
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Is any set of related work objects
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Causes the system to store the instances corresponding to two or more concrete classes that have a common key format in a single database table
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Is unrelated to your application’s Reporting requirements
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None of the above
Class table inheritance stores multiple related class types in a single database table using a common key format. Option B correctly describes this ORM pattern used for mapping inheritance hierarchies. The other options are incorrect distractors that don't relate to database inheritance strategies.
A class group in Pega is a mechanism that lets multiple concrete classes sharing the same key format be stored together in a single database table, which is how Pega organizes work object storage efficiently. It's not simply 'any set of related work objects' (that's more like a work pool concept) and it does tie into reporting, since queries often run against the class-group-level table.