Which of the following is not a component of a dfd?
? dataflow
? datastore
? external entities
? relationship betweenexternal entities

Relationship between external entities

Explanation:

There are four primary components in all data flow diagrams: entity, process, data store and data flow.

Also recognized as performers, sources or sinks, and terminators, internal entities generate and consume information flowing between the diagramming entity and system. These data flows are the DFD's inputs and outputs.

No activities are generated by a data store, but it merely maintains data for subsequent access. Data stores may consist of long-term files or a batch of documents stored for a short time while waiting for processing.

Dataflow between external entities, procedures and information shops is depicted by an arrow symbol indicating the flow direction.

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