// Add a grid item to a form and require one response per column.constform=FormApp.create('My Form');constgridItem=form.addGridItem();gridItem.setTitle('Rate your interests').setRows(['Cars','Computers','Celebrities']).setColumns(['Boring','So-so','Interesting']);constgridValidation=FormApp.createGridValidation().setHelpText('Select one item per column.').requireLimitOneResponsePerColumn().build();gridItem.setValidation(gridValidation);