What is a web proxy?$1.$ A piece of software that intercepts and possibly modifies requests $($andresponses$)$ between a web browser and web server$2.$ An agent that makes decisions on the client's behalf when interacting with webapplications$3.$ A piece of software that makes a web application look like a standaloneapplication, making it easier to test$4.$ A simulator for the web, for use when off$-$line