Please choose the correct ending to complete the given sentence: Finance and Business: [header] How to avoid liability for user caused copyright infrigement [title] Pick an agent to receive complaints. [step] Copyright holders need a way to reach you to complain that pirated work is appearing on your server or website. You can designate an agent to receive these complaints.

Ending1: Sometimes it may help to do this by having a reference from someone you trust, such as a real estate agent. If you have good references, you can release them as well. Ending2: You can name an employee as the agent. [substeps] You need to register this person's name with the u.s. Ending3: Additionally, a representative of the bureau of trademarked trademarks has reputation for having legitimate complaints. [substeps] Whenever you receive complaints from reputable websites, you must give the agent sufficient business time to correct the problem so that you can sue the copyright holder for infringement. Ending4: Get his or her experience in a book on pirated content or for helping to enforce a ban on a new service. You can also use someone from you relationship as your agent for assistance with your claims.

Answer format: ending1/ending2/ending3/ending4