Northeast Hospital's Radiology Department is considering replacing an old inefficient X-ray machine with a state-of-the-art digital X-ray machine. The new machine would provide higher quality X-rays in less time and at a lower cost per X-ray. it would also require less power and would use a color laser printer to produce easily readable X-ray images. Instead of investing the funds in the new X-ray machine, the Laboratory Department is lobbying the hospital's management to buy a new DNA analyzer. Required: Classify each item as a differential cost, a sunk cost, or an opportunity cost in the decision to replace the old X-ray machine with a new machine. If none of the categories apply for a particular item, select "None: \begin{tabular}{|l|l|} \hline Example: Cost of X-ray film used in the old machine \\ \hline 1. Cost of the old X-ray machine \\ \hline 2. The salary of the head of the Radiology Department \\ \hline 3. The salary of the head of the Laboratory Department \\ \hline 4. Cost of the new digital X-ray machine \\ \hline 5. Rent on the space occupied by Radiology \\ \hline 6. The cost of maintaining the old machine \\ \hline 7. Benefits from a new DNA analyzer \\ \hline 8. Cost of electricity to run the X-ray machines \\ \hline \end{tabular}