Discussion
Slots and facets are used in
Answer: B
Slots and facets are used in frames.
A frame has slots for attributes, and facets describe properties of a slot such as its value type, range or default.
Semantic networks use nodes and links, and rules use conditions and actions, so options A and C do not use slots and facets. A frame system describes an object by a set of slots, and each slot can carry facets such as its allowed values, a default, and procedures that run when the slot is read or changed (if-needed and if-added). This is the structure that distinguishes frames from the other representations in the question.
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