单选题An administrator has a two-node PowerHA cluster in a mutual takeover configuration. He needs to updatefrom 5.5 service pack 1 to 5.5 service pack 2. Which of the following actions will perform the updates with norisk of disruption to applications runni

Unmanage resource groups on all nodes， update the cluster filesets， start cluster services on all nodes，ensure cluster services stabilize

Update the cluster filesets on all nodes. Run ’refresh -s clstrmgrES’ on one node， wait for the cluster tostabilize， repeat for all other nodes

Unmanage resource groups on one node， update the cluster filesets， start cluster services. Wait for thecluster to stabilize and repeat for all other nodes.

Bring resource groups （RGs） online on all nodes concurrently， bring RGs offline on one node， update thecluster filesets， bring RGs online， repeat for all other nodes