Which two statements about HDLC operations in asynchronous balanced mode are true? (Choose two)

Which two statements about HDLC operations in asynchronous balanced mode are true? (Choose two)
A . Each device must negotiate with its neighbors before sending frames
B . Each device must negotiate with its neighbors to recover framing errors
C . The initiating device sends a DTE frame
D . Either device can initiate transmission of frames
E . Either device can send frames at any time

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Answer: D, E