Please choose the correct ending to complete the given sentence: Finance and Business: [header] How to conduct a patent search [title] Hire professional help. [step] Patent searches can be incredibly complex and difficult to perform. If you do not feel comfortable taking on the task alone, or if you do not have the time or resources to do so, you can hire professionals to help you.

Ending1: The cost of hiring an expert should be an immediate investment. Because of the large number of attempts at patent searches, professional help is generally not really necessary. Ending2: [substeps] You may be able to hire a personal or consulting attorney to help you get a patent search done. [title] Conduct an internet search to find a patent letter for your invention. Ending3: The pto recommends that you use only reputable agents and attorneys. The pto offers a free search function where you can find qualified help. Ending4: A patent search network is strongly recommended, as it can help you gain professional credibility in the field. You can hire regular people to do your research, or you can reach out to businesses and organizations that are actively involved in the search.

Answer format: ending1/ending2/ending3/ending4