Which of the following is a type of subpoena?

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Subpoenas are legal orders that compel testimony or the production of documents. A Basic Subpoena represents the standard form used to require someone to testify or to produce evidence. The other options serve different legal tools: a writ of habeas corpus challenges unlawful detention, a search warrant authorizes a police search, and a summons to grand jury, while related to court proceedings, is specific to grand jury appearances rather than the general subpoena form. Therefore, the Basic Subpoena is the type that is, by definition, a subpoena.