A user wants to receive an email notification when the virtual machine CPU usage enters a
warning state and again when the condition enters a alarm state. Which two state changes must
be selected to receive the appropriate notifications? (Choose two.)

A.
Yellow-red state change

B.
Red-green state change

C.
Yellow-green state change

D.
Green-yellow state change

Explanation:
http://pubs.vmware.com/vsphere-4-esxvcenter/index.jsp?topic=/com.vmware.vsphere.dcadmin.doc_41/vc_client_help/working_with_alar
ms/c_working_with_alarms.html