Consider the scenario shown below, with four different servers connected to four different clients over four three$-$hop paths. The four pairs share a common middle hop with a transmission capacity of $R=400Mbps.$ The four links from the servers to the shared link have a transmission capacity of $R_S=10Mbps.$ Each of the four links from the shared middle link to a client has a transmission capacity of $R_C=70$

Mbps$.$ Which link is the bottleneck link? Format as Rc$,$ Rs$,$ or R