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Which of the following statements is true? 


Entity relationship diagrams are used to design filles


Systems overview can be prescribed by data flow diagrams


Phases, in a systems life cycle, are fixed and invariant


Only a programmer can conduct a system study



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Correct option is

Systems overview can be prescribed by data flow diagrams

Systems overview can be prescribed by data flow diagrams statements is true

Flow diagrams in general are usually designed using simple symbols such as a rectangle, an oval or a circle depicting a processes, data stored or an external entity, and arrows are generally used to depict the data flow from one step to another. A DFD usually comprises of four components.

A data flow diagram (DFD) is a graphical representation of the "flow" of data through an information system, modelling its process aspects. A DFD is often used as a preliminary step to create an overview of the system without going into great detail, which can later be elaborated.

The difference between a data flow diagram (DFD) and a flow chart (FC) are that a data flow diagram typically describes the data flow within a system and the flow chart usually describes the detailed logic of a business process. Data Flow and Flow Chart differ in processes, flow, and timing.

The term flow diagram is also used as synonym of the flowchart, and sometimes as counterpart of the flowchart.There are numerous types of flow diagram. System Flow Diagram is basically a graphical and sequential representation of the major steps involved in a systematic process.

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