(1) Frequent Pattern Mining (Total 5pt ) Please determine whether the statement is true or false and provide your explanation. (a) (2.5pt) For some transaction data, the number of frequent itemsets of size 3 was found out to be three. Is it safe to assume that there cannot be any frequent itemset of size 4 ? If no, come up with an example. If yes, justify your answer. (b) (2.5pt) Given that {a,b},{b,c} and {a,c} are frequent itemsets, {a,b,c} is always frequent