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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.
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- 2 and 3
- 2 and 3
- 1 and 3
- 1, 2 and 3
- 2 and 3
Correct Option: C
1. The context diagram always depicts the system as single bubble. Hence, it is true.
2. External entities cannot be identified at all levels of DFD’s. Hence, it is false.
3. DFD does not allow the representation of control information. Hence, it is true.
4. A data store cannot be connected to other data stores or external entity. Hence, it is false.
