Which two statements are true about the application of QoS in a converged network？（）

A. end-to-end network delay times that exceed 50 ms for real-time traffic are considered unacceptable
B. end-to-end network delay times that exceed 250 ms for real-time traffic are considered unacceptable
C. end-to-end network delay is not a factor as long as the delay is consistent
D. some packet loss can be corrected by codec algorithms
E. RSVP handles voice packet retransmission
F. fragmentation is a result of packet lo