This Workflow Action type sends field values to external resources.

The choice of POST as the correct answer relates to its functionality in web communication, particularly in the context of sending data to external resources. The POST method is designed to send data to a server, often resulting in a change of state or side effects on the server. In the context of Splunk, when a Workflow Action is created using the POST method, it allows field values from search results to be sent as part of an HTTP request to an external application or service, effectively facilitating interaction beyond the internal environment.

Using POST, users can transmit various types of data, including JSON objects or form-encoded data, which makes it particularly suitable for scenarios where you want to pass specific field values from Splunk to another system for further processing or integration.

In contrast, while GET might be seen as a method for retrieving data from a server, it does not typically allow for sending complex data structures. Similarly, the PUT method is generally employed for updating existing resources rather than sending data to a completely different system, and the Search action is more about querying indexed data within Splunk itself rather than facilitating communication with external resources. Thus, POST stands out as the most appropriate choice for the described functionality.