—What's wrong with you?

—              .        [ ]

A. I have a cold        

B. I want to take some medicine

C. I've got a new bike    

D. I'm not a doctor

Which logical channel is used to send RACH bust on uplink and TAs on downlink？（）

A.PDTCH

B.PTCCH

C.PACCH

D.PBCCH