单选题

Choose the best answer.Examine this command, which executes successfully:$ mysqlbackup --user=dba --password --port=3306 --with-timestamp --only-known-file-types
--backup-dir=/export/backups Which statement is true?

AOnly tables stored in their own tablespaces are backed up.

BOnly InnoDB data and log files are backed up.

COnly non-encrypted files are backed up.

DOnly files for MySQL or its built-in storage engines are backed up.

EThe backup includes only data files and their metadata.

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正确答案：A （备注：此答案有误）

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