Which of the Following Is TRUE

Which of the following is TRUE?

A) The most fundamental criterion in designing a marketing information system is an accurate,objective assessment of each manager's decision-making responsibilities,capabilities,and style.
B) The proper way to define what information is to be provided by a marketing information system is to ask each manager what information he or she would like to have and then go about designing a system to provide that information.
C) In a marketing information system it is important that data files be aggregated as much as possible so as to prevent the manager from being inundated with too many bits and pieces of information.
D) Both a and b are true.
E) All of the above are true.