1. The downward closure is a property used to A. Prune the number of itemsets, we should generate/check if they are frequent B. involves all items in our databases of transactions C. measures the confidence of association rules 2. The lattice structure (see the extra examples posted) prunes the space of itemsets to be considered for their frequency A. True B. False 3. The size of the database of transactions affects the running time of the association rule mining algorithm A. True B. False