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match the following in the context of data flow diagram :
i. circle a. source of data ii. square b. file or data base iii. arrow c. conversion process iv. parallel line d. data flow 1. l-a, ll-b,lll-c, lv-d 2. l-c, ll-a, lll-d, lv-b 3. l-c,ll-d, lll-a, lv-b 4. l-b, ll-a, lll-d, iv-c