host a and b are directly connected with a 100 mbps link. there is one tcp connection between the two hosts, and host a is sending to host b an enormous file over this connection. host a can send its application data into its tcp socket at a rate as high as 120 mbps but host b fills up its buffer at a rate of 40mbps. on average, what is the long-term rate at which host a sends data to host b?