You have configured a process model to send an email to one or more recipients using the out-of-the-box Send E-Mail node

[answerhappygod]

You have configured a process model to send an email to one or more recipients using the out-of-the-box Send E-Mail node.
Executing the process model results in the Send E-Mail node encountered this error: “Error:Email could not be sent”
Where do you go first to find more details on why the node encountered an error? (Choose the best answer.)

A. Raise a support case within My Appian so a cloud engineer can investigate.
B. Review the system.csv log.
C. Run and review the Health Check report
D. Investigate the application server stdout log