Which formats may be used to add a custom campaign parameter to a URL? - The Future Of Ink

Home Google Analytics For Beginners Assessment Which formats may be used to add a custom campaign parameter to a URL?

www.googlemerchandisestore.com/?utm campaign = fallsale
www.googlemerchandisestore.com/?utm_campaign=fallsale
www.googlemerchandisestore.com/?utm_campaign=fall_sale
www.googlemerchandisestore.com/?utm_campaign = fall sale