Question: Customer is using MySQL Binlog replication. He notices the field 'Seconds Behind Master' while running 'Show Slave Status'. How is the seconds behind master value

Customer is using MySQL Binlog replication. He notices the field 'Seconds Behind Master' while running 'Show Slave Status'. How is the seconds behind master value calculated? is it:
A. The difference between the current timestamp on the master and slave
B. the difference between the current timestamp on the slave and original timestamp logged on the master for the event currently being processed on the slave
c. difference between the time stamp when the event was sent by the master and received by the slave,
d. none of these

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