Which SDK method is used to perform cross-domain requests back to the Salesforce domain?

The method known as Cross-Domain XHR is specifically designed to handle cross-domain requests in Salesforce. Cross-domain requests are required when you need to access resources from a different domain than the originating page. This can be particularly necessary in web applications that interact with multiple services or APIs across different domains.

Cross-Domain XHR effectively manages the complexities associated with these requests, including ensuring the correct handling of cross-origin resource sharing (CORS) security policies. By using this method, developers can send requests to the Salesforce domain even when their application is served from another domain, facilitating seamless data exchange and integration.

In this context, options that refer to other methods may not specifically cater to the intricacies of cross-domain communication as effectively as Cross-Domain XHR does, resulting in the selection of this method as the most suitable choice for managing such requests.