Question Pool -- Category G2F

Why are the string of letters R and Y (sent as "RYRYRYRY...") occasionally used at the beginning of RTTY transmissions?
A.
This allows time to 'tune in' a station prior to the actual message being sent
B.
To keep these commonly-used keys funtional
C.
These are the important mark and space keys
D.
To make sure the transmitter is functional before sending a message

Answer is A.
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