A new HACMP maintenance level has recently been released. An administrator is creating a  project plan that is required for applying the updates for a three-node production cluster.  To minimize downtime，what is the best way to accomplish the updates on all cluster nodes？（）  

A.Perform a graceful takeover one node at a time and apply the updates.

B.Perform the updates on all nodes simultaneously using C-SPOC utilities.

C.Perform the updates on node at a time with the cluster software active.

D.Perform a graceful stop of all cluster nodes and apply updates to all nodes.