Which of the following is not a part of a Data Flow Diagram? A. disk storage B. arrow C. Data store D. process represented by a bubble circle (circle) E. None of the above

The correct answer is A. disk storage.

A data flow diagram (DFD) is a graphical representation of the flow of data through an information system. It is a tool that can be used to model the system’s data and processes. DFDs are typically used in the early stages of system development to help understand the system’s requirements.

The three main elements of a DFD are:

• Data stores: These represent the data that is stored in the system.
• Processes: These represent the activities that are performed on the data.
• Data flows: These represent the movement of data between the data stores and processes.

Disk storage is not a part of a DFD because it is not a process or a data store. It is a physical device that stores data.

The other options are all part of a DFD.

• Arrow: An arrow represents the flow of data between the data stores and processes.
• Data store: A data store represents the data that is stored in the system.
• Process: A process represents the activities that are performed on the data.

I hope this helps!