Which of the following statements describe secondary internal data?

Which of the following statements describe secondary internal data?
 a. A manufacturer of semiconductors uses available company sales and inventory valuation records to prepare an inventory turnover ratio for each month.
  b. A mail order company conducts a telephone survey among recent purchasers.
  c. A presidential candidate commissions a political survey organization to establish the percent of persons favoring her candidacy.
  d. A recent graduate of mortuary school samples the death rate statistics for counties in her state in hopes of finding a good location to start a mortuary.
  e. Consumers Union purchases 25 brands of lawnmowers and tests them for various attributes.