Which Is the Best Way to Identify the Root Cause

Multiple Choice

Which is the best way to identify the root cause of long read latencies using monitors?

A) Check if the %CPU Busy is above 50%
B) Check to see if all volumes are in at least 1 Consistency Group
C) Check the ratio of cache.rhit to cache.miss
D) Check the difference between fe-director.read-lat and storage-volume.read-latency