Q: Which metric reports on how often a channel contributes to a conversion prior to last-click attribution?
A) Second-to-last-click attribution
B) Last-click attribution
C) Primary conversion
D) Assisted conversion
Correct Answer is D) Assisted conversion.
Assist interaction is any interaction that is on the conversion path but is not the last interaction. If a channel appears anywhere—except as the final interaction—on a conversion path, it is considered an assist for that conversion. The higher these numbers, the more important the assist role of the channel.
Read more here: https://support.google.com/analytics/answer/1191204