Diagrams - Context diagram,DFD - Software Engineering

Q.  Identify which of the following statements are true?

1. The context diagram should depict the system as a single bubble
2. Control Information should not be represented in a DFD
3. A data store can be connected either to another data store or to an external entity.
4. External entities should be identified clearly at all levels of DFD's
- Published on 16 Jun 15

a. 1 and 2
b. 2 and 3
c. 3 and 4
d. 1,2 and 4

ANSWER: 1 and 2

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