Anatomy of a flow is described as

• A. Message source -> Message Processors with Error handling
• B. Message source -> Message Processors
• C. Message Processors -> Message Flow
• D. Message source -> Endpoints and Processors

Answer: (A)

A flow starts with a message source, which is the inbound entry point that receives the request (like an HTTP Listener). From there, the message moves through a sequence of Message Processors that perform transformations, routing decisions, data mapping, and integration logic. Crucially, error handling is built into the flow so that any exceptions raised during processing can be caught and dealt with—using On Error constructs to return proper responses, logs, or retries. This concrete path—inbound source, followed by a chain of processors, with integrated error handling—best captures how a flow is structured. The other options either omit error handling, imply an incorrect order, or misplace endpoints relative to the processing chain.