Applying a label to an ad group enables you to create remarketing lists based on what user action? - The Future Of Ink

Home DoubleClick Search Campaign Management Assessment Applying a label to an ad group enables you to create remarketing lists based on what user action?

User performing a search for any keyword in the campaign
User performing a search for any keyword in the ad group
User clicking on an ad while searching for any keyword in the ad group
User clicking on an ad while searching for any keyword in the campaign