【单项选择题】
The user base of a three-node cluster has increased. In order to add clustered users to all nodes， which of the following steps should be performed？（）  
A、A. On one of the nodes，add the users via C-SPOC ’Add a User to the Cluster’smit menu.
B、B. Use C-SPOC to synchronize the password files between cluster nodes.
C、C. On all of the nodes，add the users to the /etc/passwd and system security files，and then synchronize the cluster.
D、D. On one of the nodes，add the users to the /tec/passwd and system security files，add home directories，and use cron to automate the movement of system security files between nodes.
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