01AdventureWorksEntities context = New AdventureWorksEntities (http://localhost:1234/AdventureWorks.
03var q = from c in context.Customers
04where c.City == "London"
You need to ensure that the application meets the following requirements: "Compares the current values of unmodified properties with values returned from the data source. "Marks the property as modified when the properties are not the same. Which code segment should you insert at line 02?
context.MergeOption = MergeOption.AppendOnly;
context.MergeOption = MergeOption.PreserveChanges;
context.MergeOption = MergeOption.OverwriteChanges;
context.MergeOption = MergeOption.NoTracking;