Consider four nodes with a symmetric full mesh of traffic demands each having data rate d. That is there is a demand of d bps from each node to every other node in the network. (a) If the physical network connecting the nodes is a USHR determine an expression for the amount of traffic capacity required for any link in the backup ring as a function of d. (b) Repeat (a) if a BSHR physical network is used with load balanced shortest path routing?