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