Which two reasons could be the cause?

The administrator of Universal Containers is testing an approval process in a recently refreshed Developer Pro sandbox and is finding that none of the notification emails are being sent to the approvers.

Which two reasons could be the cause? (Choose two.)
A . The email addresses for the users are incorrect.
B . The Deliverability Access Level setting is incorrect.
C . HTML templates are NOT available in sandboxes.
D . Workflow emails only work in Full sandboxes.

Answer: AB