In making single-asset real estate investment decisions, a few common ways to determine the value of the real estate would be to use the EGIM, Direct Capitalization approach or the Net Income Multiplier approach. What is often cited as a limitation associated with these types of approaches? a. They are difficult to calculate. b. They are complex to understand. c. They fail to incorporate cash flows beyond the first year of the analysis. d. They are rarely used by industry professionals