An administrator is troubleshooting a CPU issue for a virtual machine. The following is seen in esxtop:
CPU0 is at 100% usage
The remaining logical CPUs are close to 0%
%RDY value is consistently above 10%
What is likely the cause of the CPU issue?

A.
The virtual machine has a CPU limit configured.

B.
The virtual machine’s guest operating system is configured for SMP.

C.
The virtual machine has CPU affinity configured.

D.
The virtual machine is configured with a CPU reservation.

Explanation:

By setting a CPU affinity on the virtual machine you are limiting the available CPUs on which the virtual machine can run. It does not dedicate that CPU to that virtual machine and therefore does not restrict the CPU
scheduler from using that CPU for other virtual machines.
Reference: http://frankdenneman.nl/2011/01/11/beating-a-dead-horse-using-cpu-affinity/