Which formats may be used to add a custom campaign parameter to a URL?

QUESTION 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 The correct answer is: www.googlemerchandisestore.com/?utm_campaign=fall_sale …

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