our company has a very strict vendor evaluation and approval process. It has dedicated suppliers for each material it buys. One material can have one and only one supplier. A supplier however can supply one or many materials for which it has received approval.

When you model this, which relation gets the foreign key for which relation?

Your company has a very strict vendor evaluation and approval process. It has dedicated suppliers for each material it buys. One material can have one and only one supplier. A supplier however can supply one or many materials for which it has received approval.

When you model this, which relation gets the foreign key for which relation?

An associative entity type in created and both Material$\_$ID and Vendor$\_$ID become foreign keys in it$.$

For this scenario, no foreign keys will be created