Here are three relations, $R(a,b),S(a,b),$ and $T(a,b).$ Their current

values are:

Compute the result of the query:

SELECT R$.$a$,$ R$.$b$,$ S$.$b$,$ T$.$b

FROM R$,$ S$,$ T

WHERE R$.$b $=$ S$.$a AND S$.$b &$T.b$

Identify, in the list below, the true statement about whether or

not a tuple appears in the output, and how many times it

appears.

A$)(0,1,1,0)$ appears twice.

B$)(0,0,0,1)$ appears once.

C$)(0,0,1,0)$ appears once.

D$)(1,1,1,0)$ appears once.