What should the consultant do to diagnose the issue?

Northern Trail Outfitters is sending email messages using Marketing Cloud Connect through the Sales Cloud user interface. All of their sends initiated from Sales Cloud have a status of failed.

What should the consultant do to diagnose the issue?
A . Initiate a log to troubleshoot package-related API calls.
B. Change the connection option to Scope by User.
C. Ensure the System User is assigned the Standard User Profile.
D. Manually clear the OAuth token to refresh the connection.

Answer: D