Which of the following is a valid tagged custom campaign?

Which of the following is a valid tagged custom campaign?

A) www.example.com?utm_medium=referral&utm_source=example&utm_campaign=winter
B) www.example.com?utm_campaign=fall&utm_medium=email&utm_source=newsletterl &utmcontent=al
C) www.example.com?utm_medium=cpc&utm_source=mysearch&utm_campai gn=spri ng&utm_term=backpacks
D) www.example.com?utm_medium=email&utm_source=newsletterl &utm_campaign=spring

Answer: A,B,C,D