CREATE TABLE table_35112 ("Callsign" TEXT, "Area served" TEXT, "Frequency" TEXT, "Band" TEXT, "Freq currently" TEXT, "Purpose" TEXT)

Which band serves darwin for commercial purpose?
SELECT "Band" FROM table_35112 WHERE "Area served" = 'darwin' AND "Purpose" = 'commercial'
SELECT "Band" FROM "table_35112" WHERE "Area served" = 'darwin' AND "Purpose" = 'commercial'