Perhaps you'd be interested in the entry on the philosophy of cosmology, section 3 in particular: https://plato.stanford.edu/entries/cosmology/#OrigUniv
It's actually just 1., because 2. just rerolls the question, what caused that something to begin existing?
but why should it be a matter of causing something to begin exising? maybe it's also about not preventing anything from existing?
There are two possibilities -
1. There is something, and it has always existed. 2. There is something, and it once did not exist.
Either one is weird.
The author doesn't address this, and I feel, despite their sparkling credentials, that they should have.