Nokia C SERIES New Trademark

Nokia registered new trademark Now, Is notable in the word "C SERIES" that should indicate the new version of Nokia mobile phones.

Nokia Production Lines

Nokia have main production lines are all 3 lines, N models mobile multimedia that are main pillars of Nokia and E models focusing on business. In addition models using four number.

Then Nokia C SERIES should be come from?

Computer, which may have a MID or Netbook
Camera or Carl Ziess, focused cameras.
Consumer should replace the four-digit version number. (Difficult to remember)

What is it ?