Which of the following information forms available to the marketing manager can be accessed more quickly and cheaply than other info. sources?

Customer profile due to his or her area.

D. Internal databases.Thank you  for the invitation...................

the good order is 

a. Marketing research

b. Customer profiles

c. Marketing intelligence

d. Internal databases

All experts already gives answers so agree with all of you....D. Internal databases..Thank you Sir for the invitation.

Internal Database is the right answer...

A good marketing manager should have all.

I believe it is Customer Profiles

The good marketing manager should have all of them and concentrate more on the internal database he had! in addition to the marketing research so he can gain more information about customer 

Internal Databases and Customer Profiles as well.

The answer is: Option ( D )

d. Internal databases^^^^^^^^^^^^^^^^^^^^^^^^^