How are banner markings formatted?

The formatting of banner markings is specifically designed for clarity and emphasis, which is why the correct answer is that all letters are uppercase and the text is in English only. Uppercase letters enhance visibility and legibility, making it easier for individuals to quickly identify sensitive information. This is critical in environments where quick comprehension is necessary to maintain security protocols.

Using uppercase letters for banner markings helps to draw attention and signals the importance of the information being highlighted. This formatting practice ensures that personnel handling classified information recognize and react appropriately to the sensitivity of the content.

For classified material, maintaining uniformity in language (in this case, English) is also crucial to ensure consistent understanding across all personnel involved, thus minimizing the chances of misinterpretation or oversight.