Company.com has a three-node cluster with six resource groups. There are two resource groups  for each node. A new hardware component will be added to one of the nodes. The customer wants to move the resource groups to other nodes，but not necessarily in the normal fallover order. Also，the resource groups must be moved at night when there is no one in the computer center. What can be done so that the resource group is moved at the most convenient normal fallover order. Also，the resource groups must be moved at night when there is no one in the computer center. 
What can be done so that the resource group is moved at the most convenient time for the customer？（）   

A. Create a custom resource group with a custom fallback timer to cause the system shutdown at he appropriate time.
B. Set the system to stop with "shutdown" command at the appropriate time and allow HACMP to relocate the resources.
C. Use a script that calls the cIRGmove command and place it in the cron or a queue to execute at the appropriate time.
D. Change the existing resource groups to a custom type and add a timer to perform a "shutdown -h" command at the appropriate time.