Which three slots make a useful prompt?
ATopic, Length, Language
BTask, Context, Format
CSubject, Verb, Object
DInput, Model, Output
Answer & Solution
Correct answer: B. Task, Context, Format
Card 1 names the three slots: TASK (what to do), CONTEXT (who and why), FORMAT (shape of the reply). Source: claude_constitution_ocr.md, pages 11-12.