Which of the Following Is a Disadvantage of Using Information

Which of the following is a disadvantage of using information from internal databases?

A) Obtaining information from internal databases is both time consuming as well as expensive.
B) It is impossible to verify information obtained from internal databases.
C) Using information from internal databases leads to biased research findings.
D) Internal information may be incomplete or in the wrong form for making marketing decisions.
E) Internal databases do not support highly sophisticated technologies which makes it difficult to store large volumes of data.