which three sources does the Cisco IPS appliance obtain OS mapping information?

From which three sources does the Cisco IPS appliance obtain OS mapping information? (Choose three.)

A.
from manually configured OS mappings

B.
imported OS mappings from Management Center for Cisco Security Agent

C.
imported OS mappings from Cisco Security Manager

D.
learned OS mappings from passive OS fingerprinting

E.
learned OS mappings from CiscoSensorBase input

F.
from Cisco IPS signature updates