What are the three scanning engines that the cisco IronPort dynamic vectoring and Streaming engine c

What are the three scanning engines that the cisco IronPort dynamic vectoring and
Streaming engine can use to protect against malware? (Choose three)

A.
Sophos

B.
McAfee

C.
Symantec

D.
F-Secure

E.
Webroot

F.
TrendMicro