3. 化合物命名為? (A) 1,3-dimethylbicyclo[1.2.3]hexane (B) 1,3-dimethylbicyclo[1.2.3]hexane (C) 6,8-dimethylbicyclo[1.2.3]octane (D) 6,8-dimethylbicyclo[3.2.1]octane