Regarding Ext3 file system failure repair, which of the following statements is wrong?

Regarding Ext3 file system failure repair, which of the following statements is wrong?
A . You can use the mount command to check whether the file system is mounted in a read-only state.
B . For damaged file systems in the mounted state, directly execute fsck to repair them
C . Do not arbitrarily perform fsck on a normally running file system
D . File system failures can be located by collecting Pvarflog/message host log information

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Answer: B