POSIX vs. Posix

[Karl Berry]

rms -- we've discovered that different GNU manuals spell use different
spellings for POSIX.  Since you invented the term, we thought we'd ask
you: do you have a preference for one of "POSIX" or "Posix"?

And, a second question if the answer is "POSIX": for Texinfo, do you
have a preference for @acronym (which uses a one-point-size smaller font
for TeX output to blend in with surrounding text), @sc (which uses a
much smaller font), or just the bare word (regular text size)?  (Info
output is always just the bare word.)

Thanks,
k