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Any one explain the answers of the following
lectures suny hain lakin smjh nahi aaraha k kaisy huga.Aaj grace day hai.sub nay kr lia huga.
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Q 2. Draw a Context and level 0 Data Flow Diagrams of mobile SIM registration System. Guidelines are given below. (3+7)
Guidelines / Requirements:
The context level diagram must contain a major process and external entities.
Level 0 diagram must consist of major functions and should work as follows:



 There should be 3 streams, or flows of data.
(i) The customer request to buy a number of his choice, system check the availability of number and get the details of customer for SIM card registration.
(ii) Bill will be generated on behalf of SIM card and customer detail.
(iii) And finally customer gets the SIM after payment in cash.