4 because it’s a triangular ruler
Well, I would say a web browser, like Mozilla Firefox, Safari for IOS, Windows Edge, Chrome, or Internet Explorer; and some anti-malware software, since there are multiple websites on the WWW that try to steal your information and give your device viruses.
You didn't give the options for us to choose from. But I do think I know what you are talking about. It is "Clipboard".
