Which of the following statements about marketing information systems is true?
a. computerized marketing information systems do not provide a continual flow of information, which makes it difficult to access timely information.
b. the value of decision support systems is limited because managers cannot use them while they are actually making their decisions.
c. marketing information systems are used to gather, access, and analyze data from internal sources such as financial reports, spreadsheets, and e-mails, and not external sources.
d. marketing information systems can handle big data, or data sets too large and complex to work with typical database management tools.
e. all of these statements about marketing information systems are true.