— "I stayed at a hotel while in New York."

— "Oh, did you? You _____ with Barbara."      [ ]

A. could have stayed            

B. could stay                 

C. would stay                  

D. must have stayed

未披露信息具有的特征是（）。

A、属于秘密

B、具有商业价值

C、为保密已采取合理措施

D、具有垄断性、排他性