Problem: After several mock interviews with your friend Sara in preparation for this role, you finally got hired by a global consulting firm as a supply chain expert. Your first assignment is supporting GreenRide. GreenRide is the pioneer manufacturer and seller of e-bikes in the United States, and your role is helping them optimize their distribution network, aiming to minimize the time it takes to fulfill this product demand. The company has three production facilities (PF), from where they distribute product to two regional distribution centers (DC). DCs would then fulfill the demand from four stores across the country. There's no storage space in the DCs for e-bikes, so any e-bikes coming into the DCs should leave it in the same time period. Also, note that considering the size of vehicle used and the packaging, it's only possible to deliver one e-bike per trip.