34. Which of the following statement is incorrect?

a. Combining the process map in conjunction with the systems flowchart provides a very comprehensive picture of a business process.

b. DFDs show less detail than the combination of process map and systems flowchart.

c. Because of a and b, the combination of process map and systems flowchart is always preferred to DFDs.

d. None of the above

( I want to know the reasons and how to correct the false)

Thank you