7. Which one of the following is true concerning the calculation and use of trend percentage? a. Trend analysis utilizes a floating base year depending on which year has the smallest change in rate of inflation. b. After the base year is selected, the amounts in the years other than the base year are expressed as a percent of the amounts of the base year. c. Trend percentages explain exactly what caused the specific trends to occur. d. For each year included in the trend analysis, sales, total assets, and total liabilities are expressed as 100%. e. All the above