When we evaluate investment projects, a) do we prefer higher or lower NPV? (1=higher, 2=lower) b) do we prefer higher or lower IRR? (1=higher, 2=lower) c) do we prefer higher or lower payback period? (1=higher, 2=lower) d) do we prefer higher or lower modified payback period? (1=higher, 2=lower) e) do we prefer higher or lower ARR? (1=higher, 2=lower)