Which of the following statements about the normal force F_N of the track exerted on the cart at Point P is...

8. Which of the following statements about the normal force F_N of the track exerted on the cart at Point P is correct and provides correct justification?
- F_N is greater than mg at Point P, because the cart is experiencing an upward acceleration.
- F_N = mg, because the normal force and the weight of the cart are a Newton's third law pair.
- F_N is greater than mg at Point P, because the normal force and the weight of the cart are not a Newton's third law pair.
- F_N = mg, because the cart is accelerating upwards at Point P.