Dean always chooses the company that is the least expensive. Help him decide which car rental company to go with in each of the following scenarios. (5 points: Part I - 1 point; Part II - 1 point; Part III - 1 point; Part IV - 1 point; Part V - 1 point)

Part I: Dean wants to rent a car for 12 days, but he doesn't need any insurance. Which car rental company should he choose?

Part II: Dean wants to rent a car for 3 days, and he's interested in the collision damage waiver but not the loss damage waiver. Which car rental company should Dean go with this time?

Part III: Dean wants to rent a car for the entire month of July and the first 2 weeks of August, but he doesn't need any insurance. Which car rental company is best for him?

Part IV: Dean wants to rent a car for 4 days, and he's interested in the loss damage waiver but not the collision damage waiver. Which car rental company will give Dean the better deal?

Part V: Dean wants to rent a car for the entire month of December, and he's interested in the collision damage waiver but not the loss damage waiver. At which car rental company will Dean get the better price?