Final answer:
Dynatrace Synthetic supports three types of synthetic monitoring: HTTP monitors, browser monitors, and plugin monitors.
Step-by-step explanation:
The correct answer is a) HTTP monitors, browser monitors, and plugin monitors. Dynatrace Synthetic supports these three types of synthetic monitoring. HTTP monitors are used to monitor web services via simulated HTTP requests, browser monitors simulate end-user interactions with a website, and plugin monitors allow users to create custom synthetic monitoring using custom plugins.