Of the two types of attacks that analysts investigate, established attacks can be detected by which three methods? (Choose three.)

Of the two types of attacks that analysts investigate, established attacks can be detected by which three methods? (Choose three.)
A . well-defined ACLs that are applied at the firewall
B . a decent set of IPS signatures applied
C . updated anti-virus signatures
D . updated firmware on network devices
E . updated IP/domain blacklists

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Answer: BCE