Which statement is true about transparent page sharing?

A.
It only works with Windows.

B.
It is the process of collecting unused memory from the guest OS and returning it to the VMkernel.

C.
It is the method of eliminating duplicate pages of memory allocated to multiple virtual machines.

D.
It only works with supported guest OS.

Explanation:
vSphere Resource Management Guide ESX 4.0 ESXi 4.0 vCenter Server 4.0, page 74

For example, several virtual machines might be running instances of the same guest operating system, have the same applications or components loaded, or contain common data. In such cases, ESX/ESXi systems use a proprietary transparent page-sharing technique to securely eliminate redundant copies of memory pages.