Which of these factors indicates a high likelihood that a virtual machine’s performance isbeing constrained by disk I/O?

Which of these factors indicates a high likelihood that a virtual machine’s performance is
being constrained by disk I/O?

A.
A long SCSI queue length

B.
A large number of virtual disks on its SCSI bus

C.
A large number of kilobytes read and written

D.
A large number of disk shares