Which two conditions are necessary for high availability to function between two Cisco FTD devices? (Choose two.)
A . The units must be the same version
B . Both devices can be part of a different group that must be in the same domain when configured within the FM
D . The units must be different models if they are part of the same series.
E . The units must be configured only for firewall routed mode.
F . The units must be the same model.
Answer: A,E
Explanation:
Reference: https://www.cisco.com/c/en/us/support/docs/security/firepower-management-center/212699-configure-ftd-high-availability-on-firep.html