Network Topology Setup in sucha way so that System A can ping to two Systems. System B and System C but both these systems should not be pinging each other without using any security rule

First we gonna change to network adapter to host-adapter only for all the vm.

System-A

In this we will change the IP address and then add route rules

changing the IP

changing the route table

SYSTEM-B

Same process goes for this

changing the IP address

change to route table

SYSTEM-C

And same process goes for this too..

By doing this SYSTEM-A can ping to both the systems C and B but B and C cant ping to each other.