DRAG DROP
You are supporting a WCF data contract that returns a price calculation that can be expanded to add
new data members.
Clients using the old version of the data contract must be supported.You need to define the data contract so that the data serializer can put unknown data members into a
property bag.
You have the following code:
Which code segments should you include in Target 1 and Target 2 to complete the data contract? (To
answer, drag the appropriate code elements to the correct targets in the answer area. Each code
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.)
Answer: 
https://msdn.microsoft.com/en-us/library/system.runtime.serialization.iextensibledataobject.aspx