Question: If R ( A , B ) has tuples ( 1 , 2 ) , ( 1 , 3 ) , what is the result

If R(A, B) has tuples (1,2),(1,3), what is the result of _B=3(_A(R))?
a.
None of these
b.
(1)
c.
An empty relation
d.
(3)
e.
(1,2)

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