A company processes Orders within their Salesforce instance. When an Order’s status changes to ‘Paid’ it must notify the company’s order management system (OMS). The OMS exposes SOAP web service endpoints to listen for when to retrieve the data from Salesforce.

What is the optimal method to implement this?

A. Generate the Enterprise WSDL and use it to make a callout to the OMS.

B. Generate the Partner WSDL and use it to make a callout to the OMS.
C. Create an Outbound Message that contains the session ID and send it to the OMS.
D. Create an Apex trigger and make a callout to the OMS from the trigger.