Which statement about CSS in modules is TRUE?

CSS rules will have the same effect on the page whether they’re written in the CSS section or the HTML+ HubL section of the module editor.
Module CSS is automatically scoped to modules and will not apply to other elements on a page.
CSS added to the HTML+ HubL section of the module editor will be repeated on the page in every instance of a module.
Modules require custom CSS and cannot be published without it.