A p5-550 with AIX 5.3 is being designed for availability. In addition to providing redundant adapters， which of the following should also be provided？（）

• A、Redundant processor pools， UPS， and HACMP
• B、Redundant service processors， HACMP， and mirrored AIX drives
• C、Redundant processor pools， redundant service processors， and HACMP
• D、Redundant power， redundant Virtual I/O Servers， and mirrored AIX drives