An organization has a Cisco FTD that uses bridge groups to pass traffic from the inside interfaces to the outside interfaces. They are unable to gather information about neighboring Cisco devices or use multicast in their environment. What must be done to resolve this issue? 

Answer options:

A. Create a firewall rule to allow CDP traffic
B. Create a bridge group with the firewall interfaces
C. Change the firewall mode to transparent
D. Change the firewall mode to routed

D

Reference: https://www.cisco.com/c/en/us/td/docs/security/firepower/623/configuration/guide/fpmc-config-guide-v623/ transparent_or_routed_firewall_mode_for_firepower_threat_defense.html