If you close a securities position which resulted from an option assignment on the date it was assigned to your account, it will be considered a day trade. Similarly, if you close a securities position which resulted from an option exercise on the date it was exercised to your account, it will be considered a day trade.
Accounts that have not yet been migrated to the intraday margin standards are still subject to the Pattern Day Trading (PDT) rules and are not yet subject to Intraday Margin Deficit (IMD) calls. For more information on the FINRA rule change please review the FAQs on IMD.