• Last Impression
• First interaction
• First Click
• Last Click

The correct answer is: The last Click

Explanation: By default, Search Ads 360 gives all credit for a conversion to the last click that leads a customer to your site. But a significant number of conversions may result from a path with several interactions—clicks on display ads as well as paid search clicks driven by shopping campaigns, generic or brand keywords, and other biddable items.

Read more here: https://support.google.com/searchads/answer/6194849