Which two statements are true about network voice traffic？ （Choose two.）（）
- A Voice traffic is affected more by link speed than FTP traffic is.
- B Voice traffic is affected more by packet delays than FTP traffic is.
- C Voice streams involve larger packet sizes than most TCP network traffic involves.
- D Voice traffic is more sensitive to packet loss than TCP network traffic is.
- E Voice traffic requires QOS mechanisms only in heavily loaded network segments.