The question is about identifying the term for a formal document format. 'Routine' refers to a regular procedure or task, not a document format. 'Brilliant' is an adjective describing something as very good or intelligent. 'Sailor' is a noun referring to a person who serves on a ship. 'Protocol' is the correct term as it refers to a formal set of rules or guidelines, often used in the context of official or formal documents. Therefore, the correct answer is D. Protocol.