The editors of a journal publish three issues in a year. They will devote the upcoming January, April and October issues in that order- exclusively to articles written by seven authors: A, B, C, D, E, F and G. Each of the seven authors will have at least one article published, but some may have more than one article published. The following restrictions apply to the publication of articles: If an article by A appears in an issue, then an article by B must also appear in the same issue. If an article by D appears in an issue, then an article by F must also appear in the immediately preceding issue. An article by F cannot be published in an issue that contains an article by G. No author may publish in each of the two consecutively published issues or twice in the same issue. Each of the issues being prepared must contain at least two articles. The January issue of the journal can consist exclusively of articles by which of the following groups of authors?