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NIELIT 2017 July Scientist B (IT) - Section B: 25

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Which of the following statements are TRUE? 

  1. The context diagram should depict the system as a single bubble.
  2. External entities should be identified clearly at all levels of DFDs.
  3.  Control information should not be represented in a DFD.
  4. A data store can be connected either to another data store or to an external entity.
  1. II and IV
  2. II and III
  3. I and III
  4. I,II and III
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