Question

In a physical data flow diagram (DFD), a bubble or circle could be used to specify each of the following except:

1) Input
2) Process
3) Output
4) Storage

Answer 1

In a physical data flow diagram (DFD), a bubble or circle represents a process, not an input, as inputs are depicted as data sources or data sinks. Outputs and storage are also indicated differently, with storage often shown as two parallel lines or an open rectangle.

Step-by-step explanation:

In a physical data flow diagram (DFD), a bubble or circle is typically used to represent a process. The options given in the question include input, process, output, and storage. Out of these, the one which is not usually represented by a bubble or circle in a DFD is input, as inputs are generally depicted as data sources or data sinks outside the processes.

To recap, in a DFD, a circle or bubble can represent a process, but not an input. Inputs and outputs, often shown as arrows, are what flow to and from processes. Storage can be indicated in a DFD but is more commonly represented by two parallel lines or an open rectangle, signifying a data store rather than flow.