Q: Which three campaign parameters are recommended to manually track campaigns?
A) Source, Content, and Term
B) Campaign, Content, and Term
C) Medium, Source, and Content.
D) Medium, Source, and Campaign
Correct Answer is D) Medium, Source, and Campaign
The URL Builder has six fields, but you generally need to use only Campaign Source, Campaign Medium, and Campaign Name.
Learn more here: https://support.google.com/analytics/answer/1037445