A program makes it possible to order a new car online. It contains items called Car and Customer. These items are most likely to be

arrays.
classes.
databases.
libraries.

The items called Car and Customer are likely to be classes. A class is a blueprint for creating objects (instances) with similar attributes and behaviors. In this case, the Car class would define the attributes and behaviors of a car, such as its make, model, year, and price. The Customer class would define the attributes and behaviors of a customer, such as their name, contact information, and payment details.