Question: Which entity is optional in the ERD below? ERD with entity A on the left and entity B on the right. The Crow's foot symbols

Which entity is optional in the ERD below?
ERD with entity A on the left and entity B on the right. The Crow's foot symbols from left to right are entity A, vertical line, circle, vertical line, vertical line, entity B.
Group of answer choices
Both EntityA and EntityB are optional
EntityB is optional
Neither EntityA or EntityB is optional
EntityA is optional

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