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

1. www.googlemerchandisestore.com/?utm campaign = fallsale
2. www.googlemerchandisestore.com/?utm_campaign=fallsale
3. www.googlemerchandisestore.com/?utm_campaign=fall_sale
4. www.googlemerchandisestore.com/?utm_campaign = fall sale

Correct Answer:

• www.googlemerchandisestore.com/?utm_campaign=fallsale
• www.googlemerchandisestore.com/?utm_campaign=fall_sale