In mapping of ERD to DFD

            a) entities in ERD should correspond to an existing entity/store in DFD

            b) entity in DFD is converted to attributes of an entity in ERD

            c) relations in ERD has 1 to 1 correspondence to processes in DFD

            d) relationships in ERD has 1 to 1 correspondence to flows in DFD

 (a) entities in ERD should correspond to an existing entity/store in DFD