Due to recent changes in infrastructure， a four-node cluster has been split into two locations， but  is still listed as a single site in HACMP. The location split has proceeded smoothly， the only exception being the serial heartbeats. There are constant errors causing the serial network to go up and down. 
What is the best solution to resolve this issue？（）  

Company.com has decided to implement virtual hosts in their web server. The current estimate is to create six virtual hosts with unique URL’s and IP addresses. The solution is going to use the IP aliasing faction in HACMP. 
How many resource groups are required to support this configuration？（）