Read this: The Archivist of the United States is the chief official overseeing the operation of the National Archives and Records Administration. The Archivist not only maintains the official documentation of the passage of amendments to the U.S. Constitution by state legislatures, but has the authority to declare when the constitutional threshold for passage has been reached, and therefore when an act has become an amendment.
Now answer this question, if there is an answer (If it cannot be answered, return "unanswerable"): What is the official that oversees the operation of NARA?
The Archivist