Which of the following power solutions offers the highest level of redundancy?

The option that provides the highest level of redundancy is when two power supplies are each connected to separate circuits. This design ensures that if one power supply or one circuit fails, the other power supply can continue to function, maintaining power to the critical systems. This dual approach mitigates the risk of a single point of failure and enhances reliability, which is crucial for data center operations where uptime and availability are paramount.

In this configuration, each power supply operates independently. Therefore, if there is an issue with one power supply or its associated circuit, the alternative remains operational, allowing for continuous power delivery. Additionally, this setup can also facilitate routine maintenance without disrupting power to the critical loads.

In contrast, the other solutions do not provide the same level of redundancy. A single power supply with a backup unit still relies on the primary power source, which creates a dependency that may limit redundancy during a failure. Two power supplies connected to one power source may help with load balancing but don't protect against circuit or source failure. Lastly, multiple power strips connected to one power source introduce additional points of potential failure without significantly improving redundancy for critical equipment.