1.) What's probably the traditional view which is breaking down the walls between devs and ops, developers carrying pagers, etc. I.e. at least in an idealized world, there are no devs and ops--only DevOps.

2.) As you suggest (and which probably more closely matches how "DevOps" works especially in larger organizations), an internal (or external) operations team provides a platform that developers can use. Developers are still going to be exposed to some operational details, but a lot of them are abstracted away.