What two conditions must be met when you are manually adding CheckPoint appliances to an existing cluster?

What two conditions must be met when you are manually adding CheckPoint appliances to an existing cluster?

A.
You must configure interfaces with IP addresses in each of the networks the cluster will connect to

B.
R70 is not running on the system you are adding

C.
The IP address should be the real IP address of a cluster interface

D.
R70 is running on the system you are adding

E.
The existing nodes must be running R70 and firewall monitoring is enabled on them