In which order did the events forming our solar system occur?

the solar nebula became hot and dense pulling in more gas. this flattened into a rotating disk. it spun faster and faster, forming the sun.
gas was pulled toward the center, forming the sun. gas flattened into a rotating disk and became hot and dense, forming a solar nebula that spun faster and faster.
gas flattened into a rotating disk and became hot and dense, forming a solar nebula that spun faster and faster. gas was pulled toward the center, forming the sun.
the solar nebula spun faster and faster and flattened into a rotating disk. most of the gas was pulled toward the center, where it became hot and dense, forming the sun.