Question: Assume that K is a foreign key from relation A referencing relation B , which is the following is true? For every tuple x in

Assume that K is a foreign key from relation A referencing relation B, which is the following is true?
For every tuple x in B, there is a tuple y in A such that x[K]= y[K].
For every tuple x in A, there is a tuple y in B such that x[K]= y[K].
For every tuple x in B, there is a tuple y in A such that x[K] y[K].
For every tuple x in A, there is a tuple y in B such that x[K] y[K].

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