When installing the CRS software on two or more nodes in the same cluster, how do you know it is safe to start installing the next node? （）

• A、Wait until the node is completely installed to start installation on the next one. 
• B、After you insert Disk 2. 
• C、A dialog box, "It is now safe to start installing the next node," appears during the installation. 
• D、After Windows OS is installed on the first node.