What was the album Closer: The Best of Sarah Mclachlan certified as?
CREATE TABLE "top_10_albums" (
  "rank" real,
  "artist" text,
  "album" text,
  "peak_position" text,
  "sales" real,
  "certification" text
);
SELECT "certification" FROM "top_10_albums" WHERE "album"='closer: the best of sarah mclachlan';