What is the purpose of flow control?

A.
To ensure data is retransmitted if an acknowledgement is not received.

B.
To reassemble segments in the correct order at the destination device.

C.
To provide a means for the receiver to govern the amount of data sent by the sender.

D.
To regulate the size of each segment.

Explanation:

http://whatis.techtarget.com/definition/flow-control
Flow control is the management of data flow between computers or devices or between nodes in a
network so that the data can be handled at an efficient pace. Too much data arriving before a
device can handle it causes data overflow, meaning the data is either lost or must be
retransmitted. For serial data transmission locally or in a network, the Xon/Xoff protocol can be
used. For modem connections, either Xon/Xoff or CTS/RTS (Clear to Send/Ready to Send)
commands can be used to control data flow.
In a network, flow control can also be applied by refusing additional device connections until the
flow of traffic has subsided.