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What does the slave I/O thread do?

Areads the relay log and executes the envents contained in them

Bconnects to the master and requests it to send updates recoded in its binary logs

Cacquires a lock on the binary log for reading each event to be sent to the slave

Dmonitors and schedules I/O calls to the subsystem for the relay logs

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正确答案：A （备注：此答案有误）

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