Final answer:
In a logical data flow diagram, the bubble symbol represents an individual process within the system, rather than the entire system.
Step-by-step explanation:
In data flow diagrams (DFDs), the bubble symbol commonly represents a process. However, to answer the question regarding which diagram uses the bubble symbol to represent a process and not the entire system, it would be the logical data flow diagram. To clarify:
- Context diagram: This shows the entire system as a single process and its interaction with external entities.
- Physical data flow diagram: This details how the system is implemented at present, including processes, data stores, and data flows.
- Logical data flow diagram: Here, the bubble symbol indeed represents an individual process or function within the system, rather than the system as a whole.
- Systems flowchart: This is a graphical representation of a procedure or a flow of data through an information system; it utilizes various symbols but does not focus exclusively on data flows
Therefore, the answer is 'c. logical data flow diagram' where the bubble symbol specifies a process within the system.