Which of the following would BEST ensure equal I/O distribution across all paths?

Active-passive multipathing designates one path as active and others as standby, meaning I/O is not distributed across all paths simultaneously but rather fails over in case of a path failure.

Active-active multipathing allows all available paths to the storage array to be utilized simultaneously for I/O operations, ensuring the most even distribution of I/O load and maximizing throughput. This configuration contrasts with active-passive, where only one path handles I/O at a time.

"Most recently used" is a path selection policy that prioritizes the last successfully used path, which does not ensure an equal distribution of I/O across all available paths.

Round robin is a path selection policy that cycles through available paths, but it relies on an underlying active-active multipathing configuration to truly distribute I/O across all paths simultaneously; without active-active, it cannot utilize all paths for equal distribution.