There is an ASP.NET Web site PassGuideWS.
There is an ASP.NET Web Application PassGuideApp.
A new server is added to the web farm.
Now clients are reporting that they intermittently receive invalid view state error messages.
How can this problem be resolved? Select one or two.

A.
Make sure that the web.config viewStateEncryptionMode is Auto on all the web servers.

B.
Make sure that the Global.aspx viewStateEncryptionMode is Auto on all the web servers.

C.
Make sure machine.config machineKey is the same on all the web servers.

D.
Make sure that session state mode is SQL Server on all the web servers.

E.
Make sure that the same SQL Server connection string is used on all the web servers.