It’s not any of them.
CI is a lens. It’s a way of looking at things. Not only a way of looking, it’s the compulsion to look at everything that happens in the classroom and ascertain whether it is providing Comprehended Input in a way that will get students to listen and will provide enough repetition so that the magic (acquisition) happens. The specific positions of those “sliders” might vary based on the student population (not everyone teaches elementary school; many of us teach adults, seniors, special populations, or whatever, with varying degrees of motivation and stick-to-it-iveness) and the language (some just require more repetition to even allow students to “hear” the word in their minds without someone saying it or seeing it in print first).
What does that CI lens filter?
Is it comprehended? Does everyone listening or reading understand what is being said or read? Really understand? How do you know? Spoiler alert: by doing comprehension checks early and often.
Is it personalized or compelling or interesting? Is there some reason why anyone would pay attention to what is being said or read?
Is it repeated? Can a person acquire the language without doing a lot of memorization on his or her own? Is there enough repetition to develop a “voice” to drive reading in opaque scripts, or help with recognition of complex phonics in alphabetic languages with “tough” spelling?
CPR. That’s it. That’s what CI is.