Consider this multihpop network running the $802\mathrm{.}11$ MAC protocol in ad$-$hoc mode $($RTS$-$CTS$-$

DATA$-$ACK$)$ and a link speed of $1$ Mbps:

$A===B===C===D$

Edges $\text{'}===\text{'}$ represent connectivity, so$,$ for instance, nodes B and C can communicate with each other

directly, but A and C cannot. All nodes are able to route packets on behalf of the other nodes and they

employ store$-$and$-$forward to deliver packets to the destination.

Suppose nodes A$,$ B$,$ and C have to send a lot of data frames to node D and have their link layer queue

always full.

What is the average data rate for A$,$ B$,$ and C assuming no DATA frames get lost due collisions?

Explain your answer.

Compare the data rates with the link rate.