Refer to the association marked with the number 4 in the preceding diagram. Which of the following

Question:

Refer to the association marked with the number 4 in the preceding diagram. Which of the following is the best way to implement the association in a relational database?
a. Post the primary key of purchase orders as a foreign key in inventory.
b. Post the primary key of inventory in purchase orders as a foreign key.
c. Create a linking table with a concatenated primary key.
d. Record the date of the purchase order in the inventory table.
e. None of these are a description of the correct implementation.