When is the best time to perform an anti-virus signature update?

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When is the best time to perform an anti-virus signature update?
A . Every time a new update is available.
B . When the local scanner has detected a new virus.
C . When a new virus is discovered in the wild.
D . When the system detects a browser hook.

Answer: A

Explanation:

Source: http://www.techrepublic.com/article/four-steps-to-keeping-current-with-antivirus-signatureupdates/