Which of the following statements regarding zapper fraud is true?

Select one:

a. Zapper fraud can only be identified if a backup copy of data is saved.

b. Performing a gap detection on unique transaction identification numbers helps uncover deleted transactions.

c. The only way to uncover zapper fraud would be to compare the Header File, Detail Sales File, and Tender Files.

d. Zapper software, although designed to be sophisticated, is easy to detect by routine audits.