单项选择题
Context－BasedAccessControl(CBAC)isthealgorithmoftheCiscoIOSfirewallfeature.HowdoesCBACimproveTeleworkersecurity?（）
- A.InboundpacketsarepermittedonlyiftheyarepartofalegitimatedataflowinitiatedbyadeviceontheTeleworkerhomenetwork.
B.Allpacketsarecheckedforintegritybyanalyzingtheirchecksum.
C.EverypacketischeckedtoseeifitwassentthroughtheVPNtunnel.
D.EverypacketisinspectedtoseeifanydisallowedURLsareincluded.URLsareforwardedtothesecuritycacheengineforauthorization.
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