To answer this question, we need to understand which controls can activate the PrintPage event.
Option A) PrintDialog - This option is incorrect because the PrintDialog control is used to display a dialog box that allows the user to select a printer and set its properties. It does not directly activate the PrintPage event.
Option B) PrintPreview - This option is incorrect because the PrintPreview control is used to display a preview of the document before printing. It does not directly activate the PrintPage event.
Option C) PageSetupDialog - This option is incorrect because the PageSetupDialog control is used to display a dialog box that allows the user to set page-related properties, such as paper size and margins. It does not directly activate the PrintPage event.
Option D) Both a and b - This option is correct because the PrintDialog control and the PrintPreview control can both activate the PrintPage event. The PrintDialog control can activate the PrintPage event when the user selects a printer and clicks the Print button. The PrintPreview control can activate the PrintPage event when the user navigates to a different page in the preview.
Option E) All of the above - This option is incorrect because the PageSetupDialog control does not directly activate the PrintPage event.
Therefore, the correct answer is D) Both a and b.