Which of the following is an authentication method supported by WebChecks?

The correct choice is webforms, as this option directly pertains to a common method used for user authentication in web applications. WebChecks, a feature of Dynatrace, allows users to simulate how real users interact with a web application. One key aspect of this simulation is the ability to handle different types of authentication mechanisms, and webforms are prevalent in many applications. In a webform authentication scenario, users typically fill out a form with their credentials—such as a username and password—which the application then verifies in order to grant access. This method allows for capturing the user experience accurately during performance monitoring.

The other authentication methods mentioned, while relevant in broader contexts, are not specifically supported in the same manner by WebChecks. APIs tend to be more about programmatic interactions rather than user-based actions, security tokens usually involve backend implementation, and digital certificates are often used for encrypted communications or secure server identity rather than for direct access through user interfaces. Thus, webforms are the most applicable choice for authentication in the context of WebChecks.