What is a possible reason for this?

The cluster level backend IOPS performance graph shows a higher-than-average number of IOPS.

What is a possible reason for this?
A . Data resynchronizations
B . Low volume of vSAN vital memory pools
C . DRS invoking multiple vMotion migrations
D . Destaging congestion

Answer: A

Explanation:

Reference: https://kb.vmware.com/s/article/2144493