You are provisioning and configuring a Service Bus processor for AI batch jobs.

Verified Answer: 1) Create the Service Bus client; 2) create the queue processor/receiver; 3) register message and error handlers; 4) start the message processor.

Detailed Explanation: The processor depends on a namespace client/connection, so the client is created first. Next, the queue-specific processor or receiver is created from that client. Message and error callbacks must be registered before processing starts so incoming messages and failures have defined handlers. Starting the processor is therefore the final step. Dead-lettering failed messages is an optional application settlement decision and is not a prerequisite for constructing and starting the processor.

Study Guide Alignment: Azure service integration: Service Bus, Event Grid, Azure Functions triggers/bindings, and event-driven processing.

Official Microsoft Learn References: AI-200 Study Guide | Service Bus message transfers, locks, and settlement