Final answer:
The appropriate email template for an auto transaction depends on the specific stage of the customer's request and the company's communication procedures. Therefore, the correct option is 1).
Step-by-step explanation:
Choosing the correct email template to send to a customer when processing an auto transaction (abbreviated as 'auto xo') depends on the company's specific procedures and the context of the transaction. Template A might be suitable for an initial confirmation of receipt of the request, Template B could be appropriate for an update on the processing status, Template C might be used for a request for additional information, and Template D could serve as a final confirmation that the process is complete. The best practices recommend personalizing the email to address the customer's needs directly and ensure clarity on the transaction status.
Therefore, the correct option is 1).