Which of the following is an example of an event parameter in Google Analytics?

An event parameter in Google Analytics refers to specific details associated with an event that provides more context about that event. In this case, the name of a video watched on the site serves as a parameter that describes the specific instance of the event occurring, such as when a user plays a video. This parameter helps marketers and analysts understand which videos are being engaged with, allowing for deeper insights into user behavior.

The other options represent different types of data points: the time taken to complete a purchase is a metric that measures performance, the number of users who visited the site is a general metric capturing volume, and the type of device used is more like a user property than a specific event parameter. While all these data points are valuable in understanding user interactions, only the name of a video provides specific details related to an event in the context of GA4.