Right answer is (d) compresses web pages, JavaScript and CSS
The best explanation: Basically Gzip compression is used to compress text data in websites. Gzip compression is very useful in web performance optimization. It compresses web pages, JavaScript and CSS. Gzip is also one of the file formats. Gzip compression can be enabled via webserver configuration. Common webservers where it can me make enable is .htaccess, Nginx, Apache and Litspeed.