i hope to get Right answered

During a literature review, sometimes you discover that the author (A) has mentioned another author (B). Then, it is a good idea to: a. Cite author (A) if you decided to use the source. b. Find and read the original source before citing it to author (B). Oc Better not to refer to this source. d. Cite author (B) if you decided to use the source. A Research hypothesis is not required in the following type/s of research: (More than one correct answer) Select one or more: a. Descriptive b. Exploratory c. Longitudinal. d. Cross-sectional