$1\mathrm{.}4-9$ Maximum end$-$end throughput $($f$).$ Consider the scenario below where $4$ TCP senders are connected to $4$ receivers. Senders transmit to the receiving hosts at the fastest rate possible $($i$.$e$.,$ at the rate at which the bottleneck link between a server and its destination is operating at $100\%$ utilization, and is fairly shared among the connections passing through that link$).$ R $=1$ Gbps and again Rc is $300$ Mbps and Rs is $400$ Mbps and that all four senders have data to send,

What is the minimum value of Re that will ensure that the connections to Host$-1$ and Host$-2$ are not bottlenecked at links with capacity Rc or Re$?$

$2*$Rc

$$ Rc

$$ Rs

$$ R