Metro Electronics has replaced its traditional light fittings and switches with adaptive switches that allow users to adjust their lighting as per their need. Consumers can purchase one switch per room, which can be adjusted to make lighting suitable for parties, quiet evenings, or romantic moments. In this way, Metro Electronics has addressed different needs of its consumers with a useful, economic, and easy-to-use product. Which of the following concepts does this scenario best illustrate? (Select all that apply.) Built-to-order Batch production Cost production Mass customization