In problem-solving with the decision-making framework, one O should use the total cost approach since it is less tedious and less time consuming to compute, and is also, more accurate with a final result. must only use the total cost approach since it is the most comprehensive approach. O must only use the relevant cost or the differential approach since it isolates specifically what changes and what does not change. O can use either the total cost approach or the relevant cost approach, since the end result will be the same using either method