What is the maximum number of VMkernel swap files that an ESX Server can have on a single VMFS volume?

A.
1 per virtual machine

B.
VMkernel swap files must be stored locally on the ESX Server

C.
1 per virtual disk

D.
1

Explanation:
Configuration Maximums VMware vSphere 4.0 and vSphere 4.0 Update 1, page 5.

Memory Maximums
Table 4. Memory Maximums

Item Maximum
Swap files 1 per virtual machine