Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to unblock blocked sites [title] Find a good web-based proxy server. [step] Proxy servers act as medium, visiting a blocked site for your computer, then showing it to you. Additionally, your ip address and location are not tracked, so you effectively become anonymous online.

Ending1: All that's left is to find a good internet server to perform a internet search on. [substeps] Find a good internet server to perform an internet search on. Ending2: [substeps] A good proxy service will not have too many ads or popups. Advertisements are very common and can be a big downside to using many free proxy servers. Ending3: However, many proxy servers have anti-virus and privacy protection software you can install yourself if necessary. Proxy servers do not require you to set up your own ip address. Ending4: [substeps] A reputable proxy server can potentially send viruses or other legal risks to your encrypted web pages, making it your only one option. [title] Set up a virus free proxy server.

Answer format: ending1/ending2/ending3/ending4