While working as a help desk technician, you are faced with a reported issue that a certain application is not starting on several computers within the organization. You've gathered the necessary information, duplicated the problem, and questioned the users. What is the most effective next step in identifying the probable cause of the application failure?
Directly edit the application's source code to find potential bugs.
Advise users to restart their computers until the application starts successfully.
Replace all the computers where the application failed to start.
Consult the application's knowledge base or the Internet for similar issues and documented solutions.