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

A.
Excessive disk and network I/O will slow the creation of new sessions.

B.
Excessive disk and network I/O on the data collector will slow down Web Interface authentication.

C.
Excessive disk and network I/O on the data collector will slow down application enumeration.

D.
Excessive disk and network I/O on the XenApp server will affect the local host cache.