1.A data flow diagram:

A.

Is a graphical description of the source and destination of data that shows how data flow within an organisation.

B.

Is a graphical description of the flow of documents and information between departments or areas of responsibility.

C.

Is a graphical description of the relationship among the input, processing, and output in an information system.

D.

Is a graphical description of the sequence of logical operations that a computer performs as it executes a program.