In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.
In low-speed network, it is usually adequate to wait for congestion to occur and then react to it by telling the source of packets to slow down. In high-speed networks, this approach often works poorly, because in the (1) between sending the notification and notification arriving at the source, thousands of additional (2) may arrive. In ATM network, a major tool for preventing (3) is (4) control. When a host wants a new virtual (5) , it must describe the traffic to be offered and the service expected.
4（）
A．flow
B．admission
C．traffic
D．time
则z=3x+2y的最大值是（）。