Which of the following should the technician do FIRST?

A technician arrives on site to find that two users who have the same model on Android smartphone are having the same issue with a specific application.

Whenever they attempt to launch the application, it fails and gives an error message.

Which of the following should the technician do FIRST?
A . Reinstall the application
B . Roll back the application to the earlier version
C . Clear the application cache
D . Update the OS of the smartphones

Answer: D