"Risk" is usually Select one: O a. Increases O b. reduces as the project progresses c. remains same O d. becomes negligible What would be the payback period of excavator generating annual return of $70000 and initial cost $350000 and service life 7 years? Select one: O a. 2 YEARS O b. 3 YEARS O c. 4 YEARS O d. 5 YEARS Railway projects are treated as Select one: O a. Light construction Ob. Industrial construction O c. Heavy construction Od. None of the above e. All of the above