A database has five transactions. Let min sup = 60% and min conf = 75%. TID T100 T200 T300 T400 T500 Items-bought C, E, E, K, K, M, N, N, O, O, Y, Y C, C, D, D, D, E, K, O, O, Y A, A, E, E, K, K, K, M, M, N, N. A, C, C, C, M, O, U, U, U, Y C, E, E, I, I, I, I, K,K, O, O, O (a) Find all frequent itemsets using Apriori method. (b) List all of the strong association rules (with support s=60% and confidence c=75% matching the following metarule, where X is a variable representing customers, and item denotes variables representing items (e.g., "A", "B", etc.): buys(X; item1) and buys(X; item2)) => buys(X, item3) (s; c)