Analogy — Legal/official calling instrument: Visitor : Invitation :: Witness : ?

Introduction / Context:
We match a person to the formal instrument that compels or authorizes their appearance. A visitor arrives by invitation; what compels a witness to appear?

Given Data / Assumptions:

• Visitors often receive invitations.
• Witnesses in legal proceedings are compelled by subpoenas.

Concept / Approach:
Find the precise legal term paralleling “invitation.”

Step-by-Step Solution:

Why Other Options Are Wrong:

• Permission: general consent, not a compulsion to appear.
• Assent: agreement/approval; wrong category.
• Document: too generic; many documents exist.
• None of these: incorrect because “Subpoena” fits.

Common Pitfalls:
Choosing broad terms like “document” instead of the specific legal instrument.

Final Answer:
Subpoena