Question: Consider a transaction database that contains items {A, B, C, D, E}. Suppose {C, D, E} is a frequent itemset and {A, B, C} is

Consider a transaction database that contains items {A, B, C, D, E}. Suppose {C, D, E} is a frequent itemset and {A, B, C} is an infrequent itemset. Then, which of the following statements is NOT always true?

a. {C} must be frequent

b. {A, B, C, D, E} must be infrequent

c. {A, B} must be infrequent

d. {D, E} must be frequent

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