Prior to Starting an EMC Avamar Node Add and Rebalance

Prior to starting an EMC Avamar node add and rebalance procedure, what should be done first to ensure that the activity can be completed without data loss?

A) Perform a full system pre-upgrade health check
B) Perform an orderly reboot of all nodes in the grid
C) Run 'asktime' to ensure all node clocks are synchronized
D) Add the new node names and IPs to the /etc/hosts file