For an organization that is experiencing outages due to malicious code, which of the following is the BEST index of the effectiveness of countermeasures?

For an organization that is experiencing outages due to malicious code, which of the following is the BEST index of the effectiveness of countermeasures?
A . Number of virus infections detected
B . Amount of infection-related downtime
C . Average recovery time per incident
D . Number of downtime-related help desk calls

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Answer: B