Question: If R ( A , B ) has tuples ( 1 0 , 2 0 ) , ( 2 0 , 3 0 ) ,

If R(A,B)has tuples (10,20),(20,30),what does _B=20(_A(R))return?
a.(10)
b.(20)
c.None of these
d.(10,20)
e.An empty relation

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