Rank the following steps that lead to a Type II supernova event in order of when they occur from first to last
1) Fusion ceases: Occurs when a high mass star's core becomes dominated by iron, halting the nuclear fusion process. The star's core can no longer maintain equilibrium, and the core begins to contract
2) Photodisintegration of core atoms: The gravitational compression generates heat, which initiates photo disintegration
3) Neutronization begins: and protons and electrons combine to form neutrons and neutrinos. The neutrinos are able to escape the star, carrying off energy, causing further contraction of the star.
4) Core rebound:when the core contracts to the point where neutrons come into contact with each other, the core rebounds, sending out an energetic shockwave. This shockwave blasts the outer layers of the star into space, leaving behind a neutron core