CREATE TABLE table_3804 ("Stage" FLOAT, "Winner" TEXT, "General classification" TEXT, "Mountains Classification" TEXT, "Points classification" TEXT, "Sprints Classification" TEXT, "Team Classification" TEXT)

If the winner is Rui Costa, who made the mountains classification?
SELECT "Mountains Classification" FROM table_3804 WHERE "Winner" = 'Rui Costa'
SELECT "Mountains Classification" FROM "table_3804" WHERE "Winner" = 'Rui Costa'