Final answer:
A horizontal prototype is the one that covers the user interface through all the technical services layers, providing a broad view of the system's components and their interactions.
Step-by-step explanation:
The prototype that implements a slice of application functionality from the user interface through all the technical services layers is known as a horizontal prototype. This type of prototype is developed to encompass many or all of the features of the application, but these features are not fully functional. It is designed to provide a broad view across the entire system to demonstrate how different components will interact with each other and with users.