Hello! I'm in the process of filing my N-400 application, and I'm encountering a problem. The application asks for information about my husband's previous spouse. They divorced a long time ago, and while she was a permanent resident at the time of their marriage, we have no way of knowing if she is still a resident or has since become a U.S. citizen. The N-400 question specifically asks whether the ex-spouse is a U.S. citizen. Please what should I do? Thank you!