I believe that the multiple questions attached to this question is
a) Hello b) Link groups c) Path groups d) Heartbeats
The Answer is B and C The physical interfaces that are supposed to be monitored are connected into a link group and a firewall failure can be triggered when one or all physical interfaces in the group failPath Monitoring helps monitor the full path to mission critical IP addresses. By default, any one of the IP addresses becoming unreachable will end up causing the firewall to change the HA to tentative state
The 3-dimensional diagrams also known as a 3D graph, it implies to 3D design, which Occasionally receives the 2D data, which effects 3D and It is a terrible form.
The whole additional dimension comes to an end but never more than inserting a chart or its readability could be dramatically affected.
It uses the 3D to create a single dimension, but the information is not a great training.