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