How can you detect a false negative on an IPS?

A.
View the alert on the IPS

B.
Use a third-party to audit the next-generation firewall rules

C.
Review the IPS console

D.
Review the IPS log

E.
Use a third-party system to perform penetration testing

Explanation:
Only penetration testing can confirm this. All the other options lead to inconclusive results and
may still result in false negatives.