Which of the following statements is correct?

The addition of HBr to 1,3-butadiene produces both l-bromo-2-butene and 3-bromo-1-butene which are in equilibrium with each other. The relative amounts of the two are temperature dependent.

The addition of HBr to 1,3-butadiene at 40 °C produces 3-bromo-1-butene as the major product.

The treatment of gaseous propene with chlorine at 500-600 °C yields 1,2-dichloropropane.

The addition of HBr to 1,3-butadiene at - 80 °C produces l-bromo-2-butene as the major product.