The principal capital budgeting models for evaluating IT projects are the payback method, the accounting rate of return on investment $($ROI$),$ net present value, and

A$.$ the internal rate of return $($IRR$)$

B$.$ external comparisons systems $($ECS$)$

C$.$ data collection systems $($DCS$)$

D$.$ external marketing return $($EMR$)$

E$.$ organizational climate analysis $($OCA$)$