Considere as seguintes tabelas (t):

SELECT r1.col2 as col
FROM t1 AS r1
WHERE EXISTS (SELECT 1 FROM t2 AS r2 WHERE r1.col1=r2.col1)
UNION
SELECT r1.col3 as col
FROM t2 AS r1
WHERE EXISTS (SELECT 1 FROM t1 AS r2 WHERE r1.col1=r2.col1)
ORDER BY col

Assinale a alternativa que corresponde ao resultado retornado pela consulta SQL.