$.$ Each Vendor has a unique Vendorld. Each activity has a unique code. Each PurchaseOr $($Hint: these tell you what can be used as the primary key for each table, which is associate

$.$ Each payment must be associated with one POnumber.

$.$ The maximum budget of any activity is $$350,000.$

$.$ All Purchase Order expiration dates are on or after $1/1/2019.$

$.$ Each payment can correspond to multiple activity codes. For each payment, the