There is WCF (Windows Communication Foundation) application PassGuideApp.
There is a data contract PassGuideData, with several data members, that is used by
PassGuideApp.
Consider a serialized instance of PassGuideData which is deserialized. If any of data members
are not available PassGuideApp must throw a Serialization Exception.
What action should you take? Select three.

A.
For each data member…

B.
Use PassGuideData and..

C.
Set a default value in each of the data member declarations.

D.
.. Set the IsRequired property..

E.
.. Emit Default Value proper..

F.
.. Order property..

G.
..add the Unknown Type attribute.

H.
..add the Known Type attribute.

I.
..to false.

J.
..to true.
K.
.. to a unique integer value.
L.
.. to a unique string value.

Explanation: