Q: Which default traffic source dimensions does Google Analytics report for each website visitor?
A) Source, Medium, Campaign, and Ad Content
B) Campaign and Medium
C) Campaign and Ad Content
D) Source and Medium
Correct Answer is D) Source and Medium.
Source/Medium is a dimension that combines the dimensions Source and Medium. Examples of Source/Medium include google/organic, example.com/referral, and newsletter9-2014/email.
In Google Analytics, every website visitor has a corresponding source and medium. For example, google/organic, example.com/referral, and newsletter1/email. Source and Medium are default source dimensions in Google Analytics.
Tip: Don’t confuse sources with mediums as it often happens. Source is the origin of your traffic. While Medium is a category of a traffic source.
Learn more on the official Google support website.