Discussion
A supertype/subtype hierarchy is which of the following?
Answer: C
Correct answer: Each subtype has only one supertype.
A hierarchy is a tree: every subtype has exactly one immediate parent, so attributes are inherited along a single path and there is no ambiguity about where a value comes from. Where a subtype genuinely has two parents the structure is a lattice rather than a hierarchy, and multiple inheritance must be dealt with explicitly.
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