There are two possible answers to this. The first one is A and the other one is D. Computers need to use IP addresses in order to make it easier for “computer language” to be used and translated. All of the computers and other gadgets would need to use the IP address otherwise it will not be able to load some websites.
In short, the IP address will work as your identity online. This is why some people who leave messages anonymously can still be detected by some applications. They can be traced through the IP address that their computer or other gadget leaves whenever a website is visited.