Nicklin Corporation is considering two alternatives, code-named M and N. Costs associated with the alternatives are listed below Alternative M Alternative N Supplies costs Power costs Inspection costs Assembly costs S 77,000$ 68,000 $ 49,000$49,000 $ 29,000 $ 42,000$ 31,000 $ 44.000 Required a. Which costs are relevant and which are not relevant in the choice between these two alternatives? Supplies costs Power costs Inspection costs Assembly costs b. What is the differential cost between Alternative M and Alternative N? (Negative amount should be indicated by a minus sign.) ifferential