What is the main characteristic of the title format style?

The main characteristic of the title format style is that it is bolded and centered. This approach is used to emphasize the title of a document or section, making it stand out visually. By placing the title in the center and making it bold, it captures the reader's attention and clearly indicates the subject matter being addressed.

The other options do not accurately reflect the traditional characteristics associated with title formatting. For instance, using bullet points is more suitable for lists or enumerating items rather than indicating a title. Charts and tables are used for presenting data rather than serving as a title format. Additionally, small font size would reduce visibility and impact, which contradicts the purpose of a title meant to draw focus. Thus, bolding and centering are key elements that define the title format style effectively.