What is the RECNet belonging to Class A with a Power of 3,000 watts?
CREATE TABLE "s_rebroadcaster_of_cbo_fm" (
  "city_of_license" text,
  "identifier" text,
  "frequency" text,
  "power" text,
  "class" text,
  "rec_net" text
);
SELECT "rec_net" FROM "s_rebroadcaster_of_cbo_fm" WHERE "class"='a' AND "power"='3,000 watts';