- Event Tracking
- Custom Dimension
- Calculated Metrics
- Custom Report
Right Answer is
- Event Tracking
Explanation:-
Events are user interactions with content that can be measured independently from a web page or a screen load. Downloads, mobile ad clicks, gadgets, Flash elements, AJAX embedded elements, and video plays are all examples of actions you might want to measure as Events.
For more information visit at
https://developers.google.com/analytics/devguides/collection/analyticsjs/events