The students in a city's public school district are predominantly Black and Hispanic. A majority of the teachers in that school district are white. This is especially true of the oldest, longest-tenured teachers in the district -- the oldest, longest-tenured teachers are predominantly white while the youngest, shortest-tenured teachers are racially diverse. The school district agrees to a contract with its teachers union that if/when it has to lay off teachers in the future it will lay off teachers by shortest tenure (i.e., seniority), except that it will not lay off non-white teachers with the least seniority -- i.e., it will skip (not lay off) non-white teachers with the shortest tenures and lay off the next shortest-tenured white teacher instead. If this public school district's use of race in its teacher layoffs is challenged under the Equal Protection Clause, a court would require the school district to prove that: A. using race is necessary to achieve a compelling government interest B. using race is substantially related to achieving an important government interest C. using race is rationally related to any legitimate government interest D. this is not discrimination