The correct answer is D. All of the mentioned.
The httr package is a popular R package for making HTTP requests. It supports a variety of request methods, including GET, PUT, and DELETE.
A GET request is used to retrieve data from a web server. For example, you could use a GET request to retrieve the HTML code for a web page.
A PUT request is used to update data on a web server. For example, you could use a PUT request to update the content of a web page.
A DELETE request is used to delete data from a web server. For example, you could use a DELETE request to delete a web page.
The httr package provides a number of functions for making HTTP requests. The most basic function is get(), which can be used to make GET requests. The put() and delete() functions can be used to make PUT and DELETE requests, respectively.
In addition to the basic functions, the httr package also provides a number of convenience functions. For example, the head() function can be used to retrieve the first few lines of data from a web server, and the tail() function can be used to retrieve the last few lines of data from a web server.
The httr package is a powerful tool for making HTTP requests in R. It supports a variety of request methods, and it provides a number of convenience functions.