If a 1:M Relationship Is Optional on Both Sides,which of the Following

Multiple Choice

If a 1:M relationship is optional on both sides,which of the following is true?

A) The resulting foreign key can have null (empty) values
B) The resulting foreign key cannot have null (empty) values
C) The resulting foreign key must have null (empty) values
D) No foreign key is created as a result of mapping such a relationship