What power does the commission have to compel testimony?

The commission's ability to compel testimony is correctly associated with the power to administer oaths. By requiring witnesses to take an oath, the commission ensures that the testimony given is truthful and can be relied upon in proceedings. An oath is a formal pledge that obligates a witness to tell the truth, under penalty of perjury.

In legal contexts, while the other terms may represent related concepts, they do not directly pertain to the act of compelling testimony in the same way. A summons refers to a document that notifies an individual to appear in court, a subpoena is a legal order that requires a person to testify or present evidence, and an affidavit is a written statement confirmed by oath or affirmation, typically used as evidence. However, the specific power to compel individuals to provide truthful testimonies lies in the authority to administer oaths.