Company.com has a p5-570 with an application running on each of three Micro-Partitions. The disk I/O is shared through a VIO server. A technical specialist has been asked to upgrade the VIO server. Which of the following procedures should be taken to maintain the integrity of the partitions？（）
- AShut down all client partitions before updating the VIO server.
- BDisconnect the client partitions from any IP networks before updating the VIO server.
- CUpdate the client partitions to the latest OS maintenance level before updating the VIO Server.
- DUpdate the VIO server while the partitions are running， but reboot each client partition at a convenient time after the update.