What type of transactions is Emily using in her testing when she sends a series of expected data to a web application?

The correct choice is synthetic transactions, which refer to simulated user interactions with a web application that aim to mimic actual user behaviors under controlled conditions. In this context, when Emily sends a series of expected data to the web application, she is creating a predictable and repeatable testing scenario to assess the application's performance and response.

Synthetic transactions help in validating system performance, identifying potential issues before they affect real users, and ensuring that the application's functionalities respond as expected when presented with known inputs. These transactions can be automated and scheduled, allowing for consistent monitoring and analysis over time.