In what situation(s) might you want to use a more specific heading (like “Influence of Increased Textbook Costs on Quality of Instruction” instead of just “Textbook Costs”)? Select all that apply. a. if the document is several pages long and you need to remind readers of the overall topic b. always – every heading should include the subject/topic again. c. never – a heading should avoid repeating the subject/topic. d. only when using an advance organizer