What could be the cause?

A vSphere administrator discovers the size of the .vswp file for a VM with 2 vCPUs and 4GB of memory is zero.

What could be the cause?
A . All VM memory is reserved.
B . Memory reservation is not set.
C . VM is running on a snapshot.
D . VM is in a suspended state.

Answer: A

Explanation:

swap file = configured memory? memory reservation