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【单选题】

Network equipment supporting the use of flow control mechanisms has been recently installed. What is the purpose of flow control in a data network?（）

A、It ensures that data is retransmitted if an acknowledgment is not received.

B、It reassembles segments in the correct order on the destination device.

C、It provides a mechanism for the receiver to control the transmission speed.

D、It regulates the size of each datagram segment.

E、All of the above are functions of flow control

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