Regarding HSDPA flow control, which of the following statements are correct? (Multiple Choice)

Regarding HSDPA flow control, which of the following statements are correct? (Multiple Choice)
A . Reduce data delay
B. Perform each priority queue of MAC-d flow separately
C. Avoid data discarding or retransmission due to data congestion
D. Control the transmission of MAC-d or MAC-c/sh data streams on the Iub interface

Answer: ABCD