My answer is incorrect because B is the correct answer because of the ability to keep data secure is not a primary function of a compression algorithm.

My answer is incorrect because the total dollar amount of food and drinks sold during a show may be correlated with the attendance at the show, but cannot be used to determine the exact number of attendees.

My answer is incorrect because the information can be determined using the data collected, but not the way described in this option. One way to determine the method of payment that was used in the greatest number of transactions during the 7-day period is to sort the data by the method of payment as described. Instead of adding the number of items purchased for each type of payment, a count of each payment type needs to be computed. If the counts are stored in a new field, then the counts can be sorted to find the method of payment used in the greatest number of transactions.