Free radical monobromination of 2,3-dimethylbutane is done with relative reactivities per hydrogen $1^{\circ }:3^{\circ }=1:1600$. Which statements are correct?

1. A2-Bromo-2,3-dimethylbutane is more than 99% of the monobromo product.
2. B1-Bromo-2,3-dimethylbutane is less than 1% of the monobromo product.
3. CThe molar ratio (tertiary bromide) : (primary bromide) in the product is greater than 250 : 1.
4. DThe molar ratio (tertiary bromide) : (primary bromide) in the product is exactly 1600 : 1.