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In a relational database table, a primary key O can have duplicate values O cannot be a combination of several attributes O cannot have null values O can only take those values that exist in the corresponding foreign key attribute Which of the following statements is NOT TRUE for a DataReader? O It can quickly access data once in a forward-only manner It can process a set of records too large to fit into memory It cannot be used to cache records for reuse . O It can be used to modify database records After you drag a DataTable from the Data Source Panel and drop it onto a Windows form, it adds a DataGridView control to the form and creates all but one of the following objects. Which one of the following object is NOT created by the drag-n-drop process? DataAdapter O BindingNavigator BindingSource