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.