Which of the following are events in GA4?

In GA4, almost every user interaction is tracked as an event. This includes automatically collected events like firstvisit (when a user visits your site or app for the first time) and pageview (when a user views a page). Enhanced measurement events, such as scroll (when a user scrolls 90% of the page), are also automatically collected if enabled. These examples demonstrate the event-centric data model of GA4, where traditional "hits" from Universal Analytics are now uniformly categorized as events, providing a more flexible and comprehensive way to track user behavior. Therefore, all the listed options are indeed events in GA4.