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.

Which of the following statements are true? 1. The context diagram sho

1.	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.
A.	2 and 3
B.	2 and 3
C.	1 and 3
D.	1, 2 and 3
Answer» D. 1, 2 and 3

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