- Modify event
- Search Console
- Google Optimize
The correct answer is: Google Optimize
Use Google Analytics audiences to target experiments and focus on a group of users who exhibit certain behaviors when interacting with a website
Optimize allows you to test variants of web pages and see how they perform against an objective that you specify. Optimize monitors the results of your experiment and tells you which variant is the leader.
By running experiments in Optimize, you can test new website designs, layouts and content with a subset of your visitors. Instead of relying on instinct and opinion to determine the best page or site design, you can run an experiment that tests alternate designs with real-world users and get results that are simple to read and understand.
Read more here: https://support.google.com/optimize/answer/6197440