Four statements about automatic repeat requests (ARQs) are given below, but they are not in the correct order. Put the statements into their correct sequence.

i the sending computer waits for a period of time to see if the receiving computer acknowledges receipt of the data ii after a set time period, a timeout occurs which automatically triggers the re-sending of the data iii the sending computer transmits a block of data to the receiving computer iv this continues until the receiving computer sends an acknowledgement that the data has been received