0BSD is nice as well. As a bonus, it's the only PD-equivalent license allowed in Google.
The legal department's default answer is "no" to anything they haven't already said "yes" to, so it wouldn't surprise me if your default options are limited. But presumably with useful enough software under other PD-equivalent things they could be forced to say "yes". As an aside I'd be very interested to know the extent of internal audits Google does on its code for legal risks in un-cleared-by-legal dependencies, dependencies-of-dependencies, and presence of code derived from stack overflow/popular books/random places on the internet indexed by google.