A stream of voice packets transmitted over a WAN network encounters differing queuing delays. One router in the path used by the voice packets delays some of the packets for 4 ms wile transmitting a large video file, but delays other packets only 2 ms. Another router delays some packets 5 ms, but transmits others in 2 ms. How would you best describe this type of problem?

A.
end-to-end delay

B.
interference from bulk data traffic

C.
processing delays

D.
serialization delays

E.
jitter