A. Each category is linked to a single product attribute set, and only products from that category's set or any of its parent categories'

B. Each category is linked to a single product attribute set, and only products from that attribute set are allowed in the category

C. Categories have no connection to product attribute sets, and any product can be assigned to any category

D. Categories can be connected to multiple product attribute sets, and only products from one of those sets are allowed in the category