What method should be suggested in this scenario?

An analytics team wants to get real-time updates on transactional email metrics, specifically Sent and NotSent, to ensure they are fulfilling a legal obligation due to the nature of their messages.

What method should be suggested in this scenario?
A . Platform Events API
B. Data View Export with every send
C. Data Retrieves on the Send Object
D. Event Notification Service

Answer: D