Which network broadcast the game when the Western Bulldogs played melbourne?
CREATE TABLE "nab_cup_and_premiership_season_results" (
  "round" text,
  "opposition" text,
  "time" text,
  "date" text,
  "home_away" text,
  "venue" text,
  "score" text,
  "result_margin" text,
  "broadcaster" text,
  "tv" text,
  "ladder_position" text
);
SELECT "broadcaster" FROM "nab_cup_and_premiership_season_results" WHERE "opposition"='Melbourne';