You are developing a WCF service.
You need to configure the web.config file to ensure that metadata is exposed only via the MEX
protocol.
You have the following markup:

Which XML elements should you include in Target 1, Target 2, Target 3 and Target 4 to
complete the markup? (To answer, drag the appropriate XML elements to the correct targets in
the answer area. Each XML element may be used once, more than once, or not at all. You may
need to drag the split bar between panes or scroll to view content.)
Select and Place:

Answer: