Question: If in a relation R ( X , Y ) , the two attributes, X and Y , have one - to - many relationship

If in a relation R(X,Y), the two attributes, X and Y, have one-to-many relationship (from X to Y), then
either X or Y can be defined as the primary key
only X can be defined as the primary key
only Y can be defined as the primary key
(X,Y) together must be defined as the composite key

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