How to write nginx, NGINX or Nginx ?

[hpatoio]

Hello. I'm writing some documentation for a project that use NGINX. I'm
wondering what's the correct way to write nginx.

a) NGINX - Always all uppercase
b) nginx - Always all lowercase. Even at the beginning of a sentence 
c) Nginx - Always capitalized

Is there an official way ?

Thanks

--
Simone

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,255874,255874#msg-255874