Refer to the following UML class diagram to answer questions 11 to 15 below about the relational database based on this model. Purchase Orders D. Products Employees 0. 1..1 Purchases 0 Suppliers 0..1 Cash Disburse- ments 1... Cash O. 11. The Purchases table would have four foreign keys. 12. The associate between Purchase Orders and Purchases would be implemented with a linking table. 13. The Purchase Orders table would have the same foreign keys as the Purchases table. 14. Each Purchase Order would be ultimately linked to one cash disbursement. 15. The Cash Disbursements table would have three foreign keys