A production facility that requires its air to be free of particulate matter requires staff and visitors to enter the production floor by way of a single hallway that is interrupted at each of three points by a changing room. In each room, an entrant must change into a new lab jacket, a hat, and new clean shoe coverings after the room is blasted with air. The facility intends to speed up the process of entering the production facility by replacing the three rooms with two changing rooms of a new design whose method of blasting air is effective enough to maintain the required air quality.

Which of the following would be most important to know in determining whether the production facility's plan, if implemented, is likely to achieve its goal?

1. Whether the initial cost of the replacement and the additional cost of maintaining the new rooms over time is less than the additional earnings generated from time saved in the new process
2. Whether the time it will take to make the installation is worth the time that the installation will save
3. Whether the air blasting technique takes equal time in the current design of room and in the new design
4. Whether yet another air blasting technique would eliminate the need to wear lab jackets, hats, and clean shoe coverings
5. Whether staff and visitors also exit the production floor through the same changing rooms

Can some experts explain the best option?

OA C