Question 1. [6 marks] We are given four items, namely A, B, C, and D. Their corresponding unit profits are PA, PB, PC, and pp. The following shows five transactions with these items. Each row corresponds to a transaction where a non-negative integer shown in the row corresponds to the total number of occurrences of the correspondence item present in the transaction. T AB C D t1 OAO 3 t2 O t3 t4 t5 . The frequency of an itemset in a row is defined to be the minimum of the number of occurrences of all items in the itemset. For example, itemset {C, D} in the first row has frequency equals 2. But, itemset {C, D} in the third row has frequency as 1. . The frequency of an itemset in the dataset is defined to be the sum of the frequencies of the itemset in all rows in the dataset. For example, itemset {C, D} has frequency 2+0+1+3+0=6. Let f be a function defined on an itemset s (f will be specified later). One example of this functions is f(s) = ies Pi. In this example, if s = {C, D}, then f(s) = pc + PD. . The profit of an itemset s in the dataset is defined to be the product of the frequency of this itemset in the dataset and f(s). For example, itemset {C, D} has profit 6 x f( {C, D}). Answer the following two questions based on the above problem setting