$4.$Which of the following statements is NOT accurate regarding scenario analysis?

a$)$Scenario analysis is likely not as effective as sensitivity analysis for determining which variables have the greatest impact on projected NPVs$.$

b$)$ The base case scenario generally represents an optimistic estimate of NPv$.$c$)$if the NPV of the best case scenario is negative then it is likely unnecessary to create base and worst case scenarios.

d$)$ The worst case scenario generally represents a pessimistic estimate of NPV

e$)$ A positive NPV for a project's worst case scenario means it is likely theproject will in fact offer a positive return.