Which of These Statements About Marketing Information Collection Is Correct

Which of these statements about marketing information collection is correct?

A) A marketing information system should be just one aspect of marketing research.
B) Marketing research projects should always include primary data collection.
C) The most important marketing information gathered by a firm involves its internal performance.
D) A firm should not approach data collection as an activity that is only necessary when it needs to generate information about a specific marketing topic.