You need to install some patches on a Service guard none that is actively running in the cluster. Once the patch installation finishes, at least one of the patches will require a server reboot. Prior to starting the patch installation, you halt cluster activities on the node with the cmha1tnodecommand.
Why do you need to do this?
A. To prevent users from logging on B. To back up the system
C. To allow faster patch installation
D. To prevent a system TOC panic
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