Within the framework of General Relativity, what is the correct view:
Space is expanding
or
Spacetime is expanding
or are both correct, or is neither correct?

Within the framework of General Relativity, what is the correct view:
Space is expanding
or
Spacetime is expanding
or are both correct, or is neither correct?
Space is expanding. (Spacetime is static.)
That is a strange answer.
If one is talking about the standard cosmological model, AKA the Big Bang theory, then the correct answer is to say that, in one spacetime solution that is a good approximation to the dynamics of the universe, the mean distance between ideal points gets larger over time.
This is not the only spacetime solution that one can use to describe the universe. There are many solutions that can be used in standard cosmology that give different divisions of spacetime into space and time.
The expansion is something that happens to the spacetime. It is just a nice feature of the universe that we can identify a nice class of spacelike hypersurfaces that show the expansion isotropically and homogeneously to a good approximation.
That may be slightly more information than the OP was looking for. Or maybe not.
So would the question "Can time expand?" be meaningless?
You would have to provide a clear meaning. In a sense, one can say that time expands in certain foliations of spacetime. See Don Page's "How big is the universe today?" Sadly, behind a pay wall: How big is the universe today?  Springer
" Is space expanding or is spacetime expanding?"
How about neither?
Am I to conclude that both "spacetime is expanding" and "space is expanding" are both true?
That is very interesting. It feels almost intuitive. Maybe misleadingly so .
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