A company runs very large database applications on multiple HP-UX servers. They recently upgraded the device drivers for their fibre channel HBAs and have suffered numerous crashes on several systems. Which feature of Power Systems running AIX would help eliminate this problem during pre-release testing of a new device driver？（）

• A、Redundant VIO servers
• B、Storage Protection Keys
• C、Electronic Service Agent
• D、NPIV support in the kernel