Final answer:
Titles of long works should be italicized and follow standard capitalization rules. Bold, quotations, or full capitalization are not the correct formatting options for these titles.
Step-by-step explanation:
The formatting of titles for long works such as plays and novels should be italicized. This is the standard convention for titles that are published, produced, or released separately, such as books, movies, and TV series.
For example, in MLA style, you would format a book title as follows: The Great Gatsby. Note that while the title is in italics, standard capitalization rules are followed, meaning that only significant words in the title are capitalized.
Options such as placing the full title in bold print or quotes, and capitalizing all letters, do not follow the standard titling conventions for long works.