Why should disk and network I/O be used to identify bottlenecks?

A.
High disk and network I/O utilization of the Delivery Controller can indicate the presence
of a virus or malware.

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

D.
High disk and network I/O 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.

Explanation: