单选题：根据下面的文字资料回答题Flow control is a function that prevents network

根据下面的文字资料回答题Flow control is a function that prevents network congestion by ensuring that（　1　）do
not overwhelm（　2　）with data．There are three commonly used methods for handling network congestion．（　3　）is used by network devices to temporarily store bursts of excess data in memory until they can be processed（　4　）are used by receiVing devices t。help preVenttheir buffers from overflowing。（　5　）is a flow-control scheme in which the source device requires an acknowledgment from the destination after acertain number of packets have been transmitted.文中（　1　）处正确的答案是（　　）。 A．transmitting devices
B．transmitted devices
C．receiving devices
D．received devices