Which statement best describes an asynchronous processing model?

• A. The main thread does not wait for its workers to complete execution
• B. It always processes synchronously
• C. It blocks the main flow while branches execute
• D. All branch results are passed back to the main flow immediately

Answer: (A)

Non-blocking, background execution defines asynchronous processing: the main flow starts work on separate tasks and continues running without waiting for those tasks to finish. This lets the system keep moving and handle other work while the workers run, with results delivered later through callbacks, futures, or completion handlers.

This description captures the essence of asynchronous models, where the main thread does not stall while background work completes. In contrast, waiting for workers to finish, blocking the main flow, or assuming results arrive immediately are characteristics of synchronous or blocking behavior, not asynchronous.