Regarding the global configuration of file filtering configuration files for Huawei USG6000 products, which of the following descriptions is correct?
- File filtering, content filtering and anti-virus detection cannot be performed when the file is damaged. At this time, the documents can be released or blocked according to business requirements.
- When the file extension does not match, if the action is "Allow" or "Alarm", file filtering, content filtering and anti-virus are performed according to the file type Detection.
- When the number of compression layers of a file is greater than the configured "Maximum Decompression Layers", the firewall cannot filter the file.
- When the file type cannot be recognized, file filtering, content filtering and anti-virus detection are not performed.
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