A customer has provided the pSeries technical specialist with details of an HACMP solution that they would like validated. The solution is for two POWER4+ p630 servers directly attached to a FAStT600 storage server as the shared storage. Each system has the following： ？ 2 integrated network ports ？ 2 fibre channel adapter cards ？ 1 power supply and redundant cooling ？ HACMP v5.1 In addition to a second power supply， what further requirements， if any， are needed to validate this solution and ensure no single point of failure？ （）
- AOne fibre channel switch
- BTwo fibre channel switches
- CTwo Ethernet cards
- DNothing