By default, how do Outbreak filters avoid quarantining false positives?

A.
False positives are released as updates provide a better description of suspected
attachment.

B.
Positive matches are not quarantined. They are dropped.

C.
All false positives must be quarantined until a Virus signature is received so that they can
be checked.

D.
False positives do not occur as the Anti-Virus engine will check the signature against the
incoming mail. Only positive matches against the signature are quarantined for checking later on.