Question: When selecting a foreign key placement for a 1 : 1 relationship, place the PK of the entity on the mandatory side in the entity

When selecting a foreign key placement for a 1:1 relationship, place the PK of the entity on the mandatory side in the entity on the optional side as a FK, and make the FK mandatory when _____.
Group of answer choices
both sides are optional
both sides are mandatory
one side participates in another relationship
one side is mandatory and the other side is optional

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