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Bridgeport University is designing a new information system to track purchasing activity. The following database tables have been created. What are the primary keys to

Bridgeport University is designing a new information system to track purchasing activity. The following database tables have been created. What are the primary keys to each of the tables?
VendorRecord
VendorID
VendorName
Street
City
State
ZIP
POData
PONumber
PODate
VendorlD
POAmount
InvoiceData
InvoiceNumber
InvoiceDate
VendorlD
InvoiceAmount
PONumber

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