Which of the following is NOT a component of an event-based architecture?

In event-based architecture, the primary components are typically associated with the communication and handling of events. An event channel is used for the distribution of events, the event bus serves as a medium to facilitate communication between producers and consumers of events, and an event producer generates events that can be published for others to consume.

On the other hand, a data model is primarily concerned with the structure of data within an application, including how data is stored, organized, and manipulated. While data models may benefit from or interact with event-driven systems (e.g., by defining schema for the events), they are not a defining component of an event-based architecture itself. Event-based architecture fundamentally revolves around the flow and handling of events rather than the underlying data structure. Therefore, identifying a data model as not being a component of event-based architecture is correct because it does not fit the primary roles that each of the core components plays in constructing an event-driven system.