(3 marks) The Entity Relationship Diagram below shows the design of a database. Answer the following questions: 4A. An Invoice can have a minimum of how many Customers? ( 0.5 marks) 4B. A Vendor can have a maximum of how many Products? (0.5 marks) 4C. Which entity (or entities) is/are a Linking Entity? (1 mark) 4D. Where is a linking entity needed (but currently missing)? (1 mark) (3 marks) The Entity Relationship Diagram below shows the design of a database. Answer the following questions: 4A. An Invoice can have a minimum of how many Customers? ( 0.5 marks) 4B. A Vendor can have a maximum of how many Products? (0.5 marks) 4C. Which entity (or entities) is/are a Linking Entity? (1 mark) 4D. Where is a linking entity needed (but currently missing)? (1 mark)