A number of virtual machines in a vSphere 5.5 DRS cluster are connected to the same virtual
switch port group. After several of these VMs are migrated to another host, an administrator
notices that they have lost network connectivity. The Events tab in vCenter Server shows this
error message:
Failed to initialize ethernet0.
The vmkernel log file on the host running the affected VMs contains this message:

Can’t connect device:’port group name’: Out of resources.
Which caused this issue?

A.
Network I/O Control was enabled.

B.
The DRS cluster containing the VMs was set to Fully Automated with the Migration Threshold
set to Conservative.

C.
There were insufficient uplinks configured on the virtual switches.

D.
The virtual switch port allocation was changed from the default setting.

Explanation: