Final answer:
To verify if a web app has RUM enabled, search for the RUM tag in the app's source code, as it is the most direct and definitive method.
Step-by-step explanation:
To verify if a web app is enabled with Real User Monitoring (RUM), you should look for the RUM tag in the web app's source code. RUM is a feature that provides insights into user interactions with a web application in real-time. By checking the source code, usually you can find a specific RUM JavaScript snippet that has been added to enable this monitoring.
Option c), 'Look for the RUM tag in the web app's source code' is the correct answer. While some other methods like checking the browser console logs might offer hints if RUM data is being collected, the most direct and definitive way to verify if RUM is enabled is by looking for the RUM tag or script in the source code of the web application.