Answer:
D) assemble-to-order operation
Explanation:
Based on the information provided within the question it can be said that it is evident that Shiny Rides has adopted a assemble-to-order operation. This is the process that involves customizing a product as soon as a customer places an order, using existing/already made parts. Which since the product in question is a vehicle, the parts are already all made and mostly assembles, while the customization options are aesthetic pieces that are already made as well but added only on the customer's request.