Your company has a private cloud that is managed by us.ng a System Center 2012 infrastructure. You have a
web application named App1 that is hosted in another datacenter. The datacenter is not part of the private
cloud. You need to ensure that Service Manager incidents are generated automatically when App1 is
unavailable. What should you create?

A.
a Service Level Tracking object

B.
an event subscription

C.
a channel

D.
a synthetic transaction

Explanation:
https://technet.microsoft.com/en-us/library/dd440885.aspx