Consider a broadcast channel with N nodes and a transmission rate of R bps. Suppose the broadcast channel uses polling (with an additional polling node) for multiple access. Suppose the amount of time from when a node completes transmission until the subsequent node is permitted to transmit (that is, the polling delay) is dpoll Suppose that within a polling round, a given node is allowed to transmit at mo~\ (J bits. What is the maximum throughput of the broadcast channel?