What is the other name of Data Flow Diagram (DFD)?

The correct answer is Option C: Bubble chart. A Data Flow Diagram (DFD) is a graphical representation used in structured system analysis to depict the flow of data through an information system. In DFDs, processes are typically represented by circles or rounded rectangles that resemble bubbles, which is why this diagram is frequently referred to as a Bubble chart or Bubble diagram in many academic and software engineering contexts. This terminology highlights the visual structure of the diagram where data flows between these 'bubbles.' Option A (Flow chart) is incorrect because flowcharts represent control logic and sequential steps rather than data movement. Option B (Pictorial graph) is too vague, as it refers to any visual representation of data without specific structural meaning. Option D (Di-graph) is a mathematical concept involving directed graphs, not the standard terminology for data flow visualization in systems analysis.