Company.com recently experienced an unanticipated system outage when the VIO server was upgraded. The current p5-570 has six Micro-Partitions and a VIO server partition. How can a similar outage be avoided in the future？（）

A. Use DLPAR to avoid an outage.
B. Deploy a redundant VIO server in the POWER5 system.
C. Add additional Host Bus Adapters and Network adapters to the VIO server.
D. Implement a standby server and move all partitions to it before applying future updates.