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The correct answer highlights that the asynchronous mode is not supported by Serverless Workflow. In the context of serverless computing and workflow management, the synchronous mode typically allows for immediate responses as tasks complete in sequence, while parallel mode enables the execution of tasks concurrently for increased efficiency. Branching mode, on the other hand, allows workflows to diverge based on conditions, but these modes facilitate immediate or structured interaction patterns that are essential for many applications.

Asynchronous mode, however, involves processes that operate independently of the main flow and often rely on external callbacks or notifications to complete tasks. This can introduce complexities in state management and flow control that are not effectively handled by the Serverless Workflow framework. Therefore, the lack of support for asynchronous integration is crucial for ensuring that the workflows maintain a controlled and predictable execution path, making synchronous and parallel modes preferable for achieving desired outcomes within Serverless Workflow.