Final answer:
The option that provides for products within an app that has a one-time billing is A. One-time purchase.
Step-by-step explanation:
The option that provides for products within an app that has a one-time billing is A. One-time purchase. A one-time purchase allows users to buy a product in the app for a fixed price, and they can use it indefinitely without any recurring fees. This model is commonly used for apps that offer premium features or content.
For example, buying the latest iPhone via a one-time fee falls under the one-time purchase category, whereas paying for a monthly gym membership or falls under the subscription category.
A one-time purchase is when a customer makes a single purchase of a product or service via a one-time payment. For example, when you pay for the latest version of your favorite sneakers via a one-time fee, this falls under the one-time purchase category.