In my case the correct answer was 'No'.

And as explanation (although not required): it took me more than 5 seconds to come up with the answer of 2^63 which led me to favour the ill-formed option e) none, that should have read: 'none of the above'. I'd argue that there is nothing to be gained by excluding the specific correct answer (2^63)instead of the non-specific 'None' or 'None of the above'.