Which of the following is not considered a writ of attachment?

A writ of attachment is a legal tool that allows a court to seize a person's property to secure a judgment in a case. In this context, the correct answer identifies which option does not fall under that category.

The term "Detainer" refers specifically to a tool that allows a legal authority, usually in a criminal context, to hold a person in custody or to retain property. It is associated with holding a person on a criminal charge and does not involve the seizure of property to secure a judgment in a civil matter.

In contrast, the other options listed are related to different legal processes. "Habeas Corpus" is a legal order that requires a person holding another to bring the prisoner to court. A "Subpoena" commands a person to appear in court or produce evidence, and "Execution" refers to the enforcement of a court judgment, often involving the seizure of property. None of these options serve the same role as a writ of attachment. Therefore, "Detainer" is accurately identified as not being a writ of attachment.