What's the proper way to pronounce "Mac OS X"? I was inspired by the question Mac or Macintosh.

What's the proper way to pronounce "Mac OS X"? I've heard the following things used to refer to the operating system on the Macintosh:


"Mac OS Ten" ("OS" is said like "AHSS")
"Mac OS Ex"  ("OS" is said like "AHSS")
"Mac Oh-Ess Ex"
"Mac Oh-Ess Ten"
"Darwin" (People use this to refer to the operating system. Is this correct?)
Try typing

say Mac OS X


in Terminal. You'll hear what Apple thinks about it.

Hint: It's "mac oh es ten"