In the context of HCI, what is "prototyping"? a) The process of writing final code for a system. b) The iterative process of creating and refining a preliminary version of a system. c) The deployment of a system to production. d) The testing of system security features.

I am having trouble understanding the solution. Also the hints do not seem to be used. Some elaboration would be great, thanks!

The answer is not clear enough, please write in a way that can be read because I only have one try to submit.

what is the right answer?! Please don't provide hand written solution

Doesn't quite answer my question...I asked if there's a way to reason the answer WITHOUT plugging in numbers, and if not, what would be the METHOD for choosing what numbers to plug in. I didn't ask to just solve the problem. Please explain. Thank you

The Metropolitan Bus Company (MBC) purchases diesel fuel from American PetroleumSupply. In addition to the fuel cost, American Petroleum Supply charges MBC $250 perorder to cover the expenses of delivering and transferring the fuel to MBC’s storage tanks.The lead time for a new shipment from American Petroleum is 10 days; the cost of holding a gallon of fuel in the storage tanks is $0.04 per month, or $0.48 per year; and annualfuel usage is 150,000 gallons. MBC buses operate 300 days a year.a. What is the optimal order quantity for MBC?b. How frequently should MBC order to replenish the gasoline supply?c. The MBC storage tanks have a capacity of 15,000 gallons. Should MBC considerexpanding the capacity of its storage tanks?d. What is the reorder point?