A Cluster Administrator is implementing a custom resource group for a new web application. The  goal is to ensure the resource group is always active. Preference should be given to the priority node at startup time，but fallback to the priority node should be scheduled during a nonbusy time. 
Using custom resource group options， what combination best achieve the desired resource group behavior？（）   

A. Online On All Available Nodes，using a setting timer
B. Online On Home Node Only，using a fallback timer
C. Online On Home Node Only，using both setting and fallback timers
D. Online On First Available Node，using both settling and fallback timers