Question

What do the data flows in a logical data flow diagram (DFD) show?

1) The movement of data between processes
2) The movement of data between external entities
3) The movement of data between data stores
4) All of the above

Answer 1

Data flows in a logical data flow diagram (DFD) show the movement of data between processes, external entities, and data stores, meaning all of the above options are correct.

Step-by-step explanation:

Data flows in a logical data flow diagram (DFD) represent the movement of data within a system. This includes:

1. The movement of data between processes, which transform the data.
2. The movement of data between different external entities, which might be either sources or destinations for data.
3. The movement of data between data stores, which are repositories where data is held temporarily or permanently.

Therefore, the correct answer to the student's question is 4) All of the above. A DFD provides a visual representation of how data flows through a system, illustrating where it comes from, how it is processed, and where it goes.

Answer 2

The data flows in a logical data flow diagram (DFD) show 4) All of the above.

Step-by-step explanation:

In a Logical Data Flow Diagram (DFD), the data flows represent the movement of data between various components of the system. This includes the movement of data between processes, external entities, and data stores. Therefore, all of the options (1, 2, and 3) are correct. Data flows in a DFD provide a visual representation of how data is processed, exchanged, and stored within the system, contributing to a comprehensive understanding of the system's data architecture.