Regarding the description of file reputation technology in anti-virus engines, which of the following options is correct?
- Local reputation MD5 cache only has static cache, which needs to be updated regularly
- File reputation database can only be upgraded by manual upgrade
- File reputation is to perform virus detection by calculating the full text MD5 of the file to be tested and matching it with the local reputation MD5 cache
- File reputation database update and upgrade can only be achieved through linkage with sandbox
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