A is correct: The Layout model is specifically designed to capture the structural organization of a document, which encompasses elements like tables, detected selection marks (checkboxes/radio buttons), and text line positioning.

B is incorrect: Natural Language capabilities focus on understanding the meaning and sentiment of text, not on identifying graphical UI elements like checkboxes.

C is incorrect: The Read capability primarily focuses on extracting text content from documents, not on recognizing the state or presence of non-textual UI elements like selection marks.

D is incorrect: Key-value pair extraction identifies specific labels and their corresponding values (e.g., 'Name: John Doe'), which is different from detecting filled or unchecked selection marks.