Lincoln, Inc., Washington, Inc., and Adams, Inc. form Presidential Suites Partnership on February 15, 20X9. Now, Presidential Suites must adopt its required tax year-end. The partners' year-ends, profits interests, and capital interests are reflected in the table below. Given this information, what tax year-end must Presidential Suites use and what rule requires this year-end? SHOW YOUR WORK.

Presidential Suites Partnership

Year-End Profits Capital

Lincoln, Inc. 3/31 35% 30%

Washington, Inc. 7/31 30% 40%

Adams, Inc. 11/30 35% 30%