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exactly one vendor none or many ve exactly one purchase order: each order relates to c. Vendors cany vendors, one or m can place exactly one purchase order; each order relates to d. Vendors can vendors. relates can place either none or many purchase orders; each order. e. Vendors to none or many vendors. relates to exace either none or many purchase orders; each order. 2. The first stage in the systems development life cycle: a. systems design b. systems development c. systems conversion d. system analysis e. systems operation and maintenance 3. in an EER diagram is used to indicate a. processes. b. relationships. c. attributes. d. identifiers. e. sources