Each main wheel is provided with a hydraulic actuated multidisc

Each main wheel is provided with a hydraulic actuated multidisc brake unit bolted to a flange on the axle. In the above sentence ,"a hydraulic actuated multidisc brake unit" means

A.一个多刹车盘装置;

B.一个液压操纵的刹车盘装置;

C.一个液压操纵的多刹车盘;

D.一个液压操纵的多刹车盘装置;

正确答案是D