The /myfolder/my.cnf file has option set:
[mysqld]
skip-log-bin

/myfolder2/my.cnf has this option set:
[mysqld]
log-bin = /valid/path/to/mysqlbinlog

All mentioned paths are accessible to the account that you are currently using. Assume that any other options mentioned in either file are valid and legal option definitions.
You start an instance by using this command line:
mysqld —defaults-file=/myfolder/my.cnf —defaults-extra-file=/ myfolder2/my.cnf
What is the outcome?
A. MySQL starts and Binary Logging is enabled.
B. MySQL fails to start due to the conflicting options in the configuration files.
C. MySQL fails to start due to conflicting options on the command line.
D. MySQL starts but Binary Logging is disabled.
Answer: Dhttp://www.cndba.cn/hbhe0316/article/22813

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MYSQL