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: 
Explanation:
Correct please check the link : https://msdn.microsoft.com/en-us/library/system.runtime.serialization.iextensibledataobject(v=vs.110).aspx