Dane is writing a research paper on the role of women during the vietnam war, but when he enters “vietnam” into a search engine, he gets more than 900 million hits. the first page of results lists nothing but hotels and attractions in the country. all of these strategies would him to further refine his results except a. using quotation marks, such as in “women in the vietnam war” b. typing “vietnam” into multiple search engines c. using the advanced search feature to eliminate travel sites d. limiting his search to education domains