In legal context, what does 'subpoena' mean?

The term 'subpoena' in a legal context refers specifically to a command that requires an individual to appear in court or to produce documents or evidence necessary for a legal proceeding. This process ensures that the court has access to pertinent testimonies or materials, which can be crucial for the adjudication of a case.

A subpoena can compel witnesses to testify or obligate entities to provide documents, thereby playing a vital role in the discovery process of legal proceedings. The enforceability of subpoenas is rooted in the legal obligation of a person to comply with court orders, thus making 'A' the most accurate definition in this context.

The other options reflect different legal concepts that do not accurately define a subpoena. For instance, a written statement submitted to a court relates to legal filings, while a request to a police officer for an arrest pertains to law enforcement actions rather than judicial processes. Permission granted by a judge is more aligned with other legal decisions or orders but does not capture the essence of what a subpoena entails.