easy5 pts · first answer countsdata-modellingsql

What a foreign key enforces

An order_items table has a foreign key on order_id that references orders(id). What does the database guarantee?

A.Every order_items.order_id matches an existing orders.id (or is NULL)B.Every order has at least one order itemC.order_items rows are stored on the same disk page as their orderD.order_id values in order_items are unique

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