9. On February 4, Year 1, Mr. Smith made a gift in an amount sufficient to require the filing of a federal gift tax return. On October 5, Year 1, Mr. Smith died. No estate tax return will need to be filed for Mr. Smith. Assuming extensions have not been obtained, the gift tax return, Form 709, must be filed by (assuming none of the dates are Saturdays, Sundays, or holidays)