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A has a file of length 1Gigabyte to send to B, C, and D by peer-to-peer communication. Stations can send and receive at the same time, except for a...

A has a file of length 1Gigabyte to send to B, C,
and D by peer-to-peer communication. Stations can send and
receive at the same time, except for a very small delay. A, Band
D can send and receive at maximum rate1megabit/second,but C
can send and receive at maximum rate 0.5megabits/second.
With the help of time-space diagrams,find the time it
takes to deliver the file to B, C and D for three cases:
a) where A must send individually to each,one at a time.
.
b)where A sends to one of the three, say B, and B relays the file data as it comes in with a negligible
delay to one of the others, etc. Assume a station can at the same time send and receive at their maximum
rate as specified.
c)where A sends to B, and after B receives the whole file it sends to C or D, etc. In this case each can
send the whole file starting only after receiving the whole file.
If it makes a difference pick the best ordering.

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