Which method is used to add items to a combo box? a. Add b. AddItem c. Add List d. ItemAdd The text portion of a combo box is always editable. a. True b. False Which of the following stores an integer that represents the number of items in the list portion of the stateComboBox? a. stateComboBox.Count b. StateComboBox.Count.Iterns c. stateComboBox.Items.Count d. none of the above