Which one of the following statements is INCORRECT? Select one: a. Assessing stand-alone risk via sensitivity analysis shows how changes in a single variable such as unit sales affect NPV or IRR. b. Sensitivity analysis begins with a base-case scenario in which the project's NPV is found using the base case value for each input variable. c. Sensitivity analysis shows how changes in multi variables such as unit sales, cost of good sold, interest rate level, and taxes. In sensitivity analysis, each variable is fixed except one. Change this one variable to see the effect on NPV or IRR