Assertion (A): Distance of (x² - 7x + 12) km is covered in (x² - 16) hrs. Speed = km/hr Reason (R): Speed = Distance x Time = (x² - 7x + 12)(x2 - 16) km/hr 1. A is true, but R is false. 2. A is false, but R is true. 3. Both A and R are true, and R is the correct reason for A. 4. Both A and R are true, and R is the incorrect reason for A.