Which diagram is utilized to visualize data flow requirements?

The Data Flow Diagram (DFD) is specifically designed to illustrate how data moves through a system and the transformations that occur at various stages. In the context of requirements analysis, the DFD provides a clear visual representation of the inputs, processes, and outputs associated with data handling in a system. It helps stakeholders understand the flow of information and identify any potential bottlenecks in processes, enabling more informed decisions about system design and enhancements.

Other options serve different purposes; for instance, the Business Model Canvas helps in mapping out business strategies and stakeholder interactions but does not focus specifically on data flow. Functional Decomposition is used to break down complex processes into simpler components, which is beneficial for understanding functionality but lacks a direct representation of data movement. Decision Modelling focuses on decision rules within business processes, rather than the flow of data itself. Thus, when visualizing data flow requirements, the Data Flow Diagram is indeed the most appropriate choice.