Mule 3 applications are built using elements that are

• A. Mule Message Processors - Accept and process messages through a series of message processors plugged togther in a flow
• B. Mule Event Processors - Accept and process messages through a series of message processors plugged togther in a flow
• C. Mule Message Processors - Manage endpoints
• D. Mule Message Processors - Accept and process messages through a series of message processors plugged togther in a flow

Answer: (D)

Flows in Mule 3 are built from a chain of message processors that accept and process messages as they move through the flow. Each processor performs a specific task—transforming data, routing, filtering, logging, or invoking an operation—and passes the message to the next processor. Because of this chaining, the overall behavior of the application is defined by how these processors are connected in the flow. Therefore, the element type described is Mule Message Processors, which are responsible for accepting and processing messages through a series of processors plugged together in a flow. Mule Event Processors exist for handling certain kinds of events and lifecycle concerns, not to compose the main message processing path, and endpoints are entry/exit points rather than the processing steps themselves.