You create an application by using the Microsoft .NET Framework 3.5 and Microsoft
ADO.NET.The application uses a Microsoft SQL Server 2005 database that contains a
Products table and an Inventory table.The application coordinates updates between the
records in the Products table and Inventory table by loading a DataSet class named DataSet1.
You write the following code segment.
DataColumn parentColumn = DataSet1.Tables[“Products”].Columns[“ProductID”];
DataColumn childColumn = DataSet1.Tables[“Inventory”].Columns[“ProductID”];
You need to ensure that the following requirements are met when the ProductID value is
modified in the Products table:
The ProductID value is unique.
The records in the Inventory table are updated with the new ProductID value.
Which code segment should you add?

A.
DataRelation relCustOrder = new DataRelation(“ProductsInventory”, parentColumn,
childColumn);
DataSet1.Relations.Add(relCustOrder);

B.
ForeignKeyConstraint productOrderFK = new ForeignKeyConstraint(parentColumn,
childColumn);
productOrderFK.UpdateRule = Rule.SetDefault;
DataSet1.Tables[“Inventory”].Constraints.Add(productOrderFK);

C.
DataRelation relProdInvent = new DataRelation(“ProductsInventory”, parentColumn,
childColumn);
DataSet1.Relations.Add(relProdInvent);
DataSet1.Relations[“ProductsInventory”].ChildKeyConstraint.UpdateRule = Rule.SetNull;

D.
DataRelation relProdInvent = new DataRelation(“ProductsInventory”, childColumn,
parentColumn); DataSet1.Relations.Add(relProdInvent);
ForeignKeyConstraint productInvFK =
DataSet1.Relations[“ProductsInventory”].ChildKeyConstraint;
productInvFK.UpdateRule = Rule.SetDefault;

Explanation:
DataRelation-represents a parent/child relationship between two System.Data.DataTable objects.