After applying every inequality in the system, which option identifies the ordered-pair vertices where active boundaries meet? System: y ≤ 12; y ≥ -1; x ≥ -4; 2x + y ≥ -7; 2x + 3y ≤ 40; 9x – y ≤ 64. Some boundary intersections may fall outside the feasible region, so test each candidate point.