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單項選擇題

What does the appearance of the ACL tag BLOCK_WBRS in the access log mean?() 

A. the proxy blocked an outbound request because the client is infected with malware
B. the proxy blocked access to a site with a low reputation score
C. the proxy blocked access to a site because of a suspicious server response
D. your appliance or the WBRS key is out of support

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