题目9单选题
Flow control and congestion control are same at that they all limit the rate of the sender, but differ in that ____A. flow control limits its rate by the size of RcvWindow, but congestion control by the traffic on the linkB. congestion control limits its rate by the size of RcvWindow, but flow control by the traffic on the linkC. flow control mainly is accomplished by the sender, but congestion control by the receiverD. flow control mainly is accomplished by the receiver, but congestion control by the link