In which of the following ways does a POST request method differ from a GET request?

A POST request is fundamentally designed to send data to the server, and it does so by incorporating the message body within the request itself. This allows for a significant amount of data, including complex data types like JSON, to be sent, which isn't limited by URL length restrictions. This capability to convey a block of data in the body is what sets POST requests apart from GET requests, which primarily involve sending data through the URL, allowing for only limited data transfer.

In comparison, GET requests do not have a body since they append data directly within the URL as query parameters, thus exposing the data to anyone who can see the URL. Additionally, POST requests can handle larger volumes of data compared to GET requests due to the absence of constraints associated with URLs.

While options regarding URL data transmission and the requirement of a body detail aspects of the differences between POST and GET requests, they do not capture the essence of POST's ability to include significant data blocks within the request body, hence reinforcing the validity of the selected answer. Security considerations, such as those surrounding the nature of GET versus POST requests, further influence how and when to use each method, but are not the primary differentiating factor in the context of data transmission capabilities.