Suppose that you have declared a ButtonGroup named threeOptions and added three JCheckBoxes named box1, box2, and box3 to it. If you code threeOptions. setSelected(box1);, then threeOptions.setSelected(box2);, and then threeOptions.setSelected(box3);, the selected box is ____________.
a. box1
b. box2
c. box3
d. all of the above
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