What counter should an administrator check to determine…

What counter should an administrator check to determine if a virtual machine is ballooning?

A.
swapinRate

B.
vmmemctltarget

C.
swapped

D.
vmmemctl

Explanation:
https://www.vmware.com/support/developer/vc-sdk/visdk41pubs/ApiReference/
memory_counters.html