【单选题】
A It is the time between the I/O thread receiving details of the master's last transaction and the time it was written to the relay log on the slave.
B It is the time between the most recent transaction applied by a SQL thread and the time it was committed on the master.
C It is the time between the most recent transaction written to the relay logs and the time it was committed on the master.
D It is the time between the I/O thread receiving details of the master's last transaction and the time it was applied by the SQL thread.
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