D because A one-to-many relationship in one direction is a many-to-one relationship in the other direction. For example, if a customer can have many orders, then an order can have only one customer.
Statement C, “A many-to-many relationship can be implemented only by using foreign keys,” is not correct because a many-to-many relationship cannot be implemented directly using foreign keys. Instead, it is typically implemented using a junction table (also known as a bridge table or associative table) that sits between the two tables representing the entities in the relationship.
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