What failure will beacon probing identify in vSphere networking?

A.
An improper VLAN configuration on a physical switch port

B.
A disconnected network cable

C.
A VMkernel IP mismatch affecting vMotion or HA traffic

D.
Jumbo frames improperly configured on an iSCSI target

Explanation:
http://kensvirtualreality.wordpress.com/2009/04/10/the-great-vswitch-debate-part-4/(see beacon probing)