Question: Given the ERD below, what will be the constraints on the foreign key column? AIRPORT Not unique; Not required. Not unique; Is required. Is unique;

Given the ERD below, what will be the constraints on the foreign key column?
AIRPORT
Not unique; Not required.
Not unique; Is required.
Is unique; Is required.
Is unique; Not required.
Given the ERD below, what will be the constraints on the

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