I think both 2 and 4 are false.
The most reasonable thing to do, I think, is to define “mind or mindscape” differently from “brain”. There is nothing that is supernatural or non-physical about the “mind”. Even tho it is not the same thing as the “brain”. And I think that the most concise and practical way of looking at the mind is that it is the composite of all of our covert mental behaviors.
But I am not expecting to have any converts to my way of thinking about this, today.