After the body has begun shivering, what explains why it would stop shivering?

When body temperature returns to normal, the respiratory system sends a message to the skeletal system to stop shaking.

When body temperature returns to normal, the nervous system sends a message to the muscular system to stop shaking.

While body temperature is below normal, the nervous system sends a message to the skeletal system to stop shaking.

While body temperature is below normal, the respiratory system sends a message to the muscular system to stop shaking.