On first creation, in what order do these three container-side commands run?

On first creation, in what order do these three container-side commands run?

{
  "onCreateCommand": "echo create",
  "updateContentCommand": "echo content",
  "postCreateCommand": "echo post-create"
}

1. create, content, post-create
2. content, create, post-create
3. post-create, create, content
4. All three start in parallel.