What solution should a Solution Architect recommend to achieve this need?

A company wants to use Marketing Cloud to send customer electronic receipts that originate from its point of sale (POS) system. The company has a need for the receipt to be sent no more than 10 minutes after purchase and would like to track all email sends that are being placed to that customer, The Marketing Cloud Contact Key should be the Service Cloud Contact ID.

What solution should a Solution Architect recommend to achieve this need?
A . Make an API call from the POS to Marketing Cloud to send the electronic receipt and then call Service Cloud to add the customer if they do not exist. Use an automation in Marketing Cloud nightly to remove any duplicate contacts that may be introduced with Marketing Cloud Connect.
B . Make an API call from the POS to Service Cloud to retrieve the Service Cloud Contact ID. If the customer does not exist, submit a POST to Service Cloud to create the Contact ID, then send the Contact ID to Marketing Cloud via an API to send the electronic receipt.
C . Make an API call from the POS to Service Cloud to add the customer if they do not exist; leverage a custom object to send details to Marketing Cloud via Marketing Cloud Connect and synchronized data sources to send the electronic receipt.
D . Make an API call from the POS to Marketing Cloud te send the electronic receipt. No call is required to Service Cloud to fetch the Contact IO as this information is already available at the POS.

Answer: D

Explanation:

This solution allows the company to send the electronic receipt in near real time using the Marketing Cloud Transactional Messaging API, which can handle high-volume and time-sensitive messages. The POS system already has the Service Cloud Contact ID for the customer, so there is no need to make an extra API call to Service Cloud to fetch it. The Service Cloud Contact ID can be passed as the Marketing Cloud Contact Key to ensure data consistency across the systems.

References:

https://developer.salesforce.com/docs/commerce/sfra/marketing-cloud/transactional-messaging-api

https://help.salesforce.com/s/articleView?id=sf.mc_co_subscriber_key_migration.htm&type=5