Which of the following is an indication of good storage array read performance?

High CPU utilization on a storage array might indicate a bottleneck or heavy workload, but it doesn't directly measure the efficiency of read operations or overall good performance.

High adapter port utilization indicates that the ports are busy, which could be good or bad depending on throughput, but it doesn't specifically confirm efficient read performance or low latency.

High disk utilization often indicates that the physical disks are busy processing I/O requests, which can lead to increased latency and is generally a sign of a performance bottleneck, not good performance.

A 90-100% read cache hit rate indicates that almost all read requests are being served directly from the storage array's fast cache memory, significantly reducing latency and improving I/O performance compared to fetching data from the physical disk spindles. This high hit rate demonstrates efficient use of the cache, which is designed to accelerate read operations by storing frequently accessed data.