A one-to-one relationship from Entity A to Entity B is created by …

A one-to-one relationship from Entity A to Entity B is created by …
A . changing the Entity B identifier data type to <Entity A> Identifier.
B. changing the id attribute of Entity B to not be an auto-number and assigning a value to it programmatically, when creating a new record.
C. adding a new attribute to the Entity B with data type <Entity A> Identifier.
D. adding a new attribute to the Entity A with data type <Entity B> Identifier.

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Answer: A