Which the following statements about investment appraisal methods are correct?

i. the return on capital employed method considers the time value of money
ii. return on capital employed must be greater than the cost of equity if a project is to be accepted
iii. riskier projects should be evaluated with shorter payback periods
iv. payback period ignores the timing of cash flows within the payback period

a)i only
b)i and ii only
c) iii and iv only
d)i, ii and iv