Express.js middleware functions have access to the ______ object, the ______ object, and a next function in their callback function parameters.

In Express.js middleware functions, the callback function parameters typically include req (the request object) and res (the response object). Additionally, you can use a next function to pass control to the next middleware function in the pipeline. This allows you to manipulate the request and response objects or perform actions before sending a response to the client.