Why should disk I/O and page file utilization be used to identify bottlenecks?

A.
High disk I/O and page file utilization on the Delivery Controller can indicate that the
target device will encounter delays when mounting new vDisks.

B.
High disk I/O and page file utilization of the Delivery Controller may indicate that a high
number of processor-intensive applications are being utilized by the virtual desktop users.

C.
High disk I/O and page file utilization of the Delivery Controller can indicate the presence
of a virus or malware.

D.
High disk I/O and page file utilization of the Delivery Controller can indicate a high
volume of user logons, indicating that the server may NOT have sufficient resources to
handle the load.