Which of the following is the most valid statement? a. citations are only necessary for source information that is copied word for word and used in the research paper. b. direct quotations from a text, like paraphrases, do not need to have quotation marks as long as the source is cited. c. in order to avoid plagiarism, all source information must be cited, even if it is paraphrased or summarized. d. the best way to avoid plagiarism is to use only quoted, word-for-word notes with the proper citation.