Which of the following is false? (). A: The blue and white porcelain is produced by putting openwork decorations under a thin layer of bright glaze. B: Since the Song dynasty, Jingdezhen has becoem well-known for its porcelain. C: Jingdezhen’s porcelain products are exported to many countries. D: The eastern and southern parts of Jingdezhen are hilly land and plains.