The balloon driver,also know as vm memctl, is one mechanism by which ESX Server manages the allocation of memory.Which statement about it is true?

A.
The balloon driver forces a virtual machineto yield memory.

B.
The balloon driver manages the transparent sharing of memory among virtual machines.

C.
The balloon driver enables a virtual machine to allocate more physical memory.

D.
The balloon driver acts as memory for virtual machines when VMkernel swap is exhausted.