An Organization Is Setting Up Two New Cisco FTD Devices

An organization is setting up two new Cisco FTD devices to replace their current firewalls and cannot have any network downtime. During the setup process, the synchronization between the two devices is failing. What action is needed to resolve this issue?

A) Confirm that both devices are running the same software version.
B) Confirm that both devices are configured with the same types of interfaces.
C) Confirm that both devices have the same flash memory sizes.
D) Confirm that both devices have the same port-channel numbering.