What action should you take to troubleshoot this issue with the user?

A user is reporting that after they sign in to Gmail, their labels are not loading and buttons are not responsive.

What action should you take to troubleshoot this issue with the user?
A . Collect full message headers for examination.
B . Check whether the issue occurs when the user authenticates on a different device or a new incognito window.
C . Check whether a ping test to service.gmail.com (pop.gmail.com or imap.gmail.com) is successful.
D . Check whether traceroute to service.gmail.com (pop.gmail.com or imap.gmail.com) is successful.

Answer: B