Wordnumbers on NBC?

The following was a question on the NBC gameshow '1 vs. 100' from episode 4 that aired on November 3, 2006, and re-run on June 15, 2007:

If you wanted to punch in "NBC" on a phone keypad, what numbers should you press?
a) 522
b) 622
c) 722

The correct answer - 'b' - was selected by 61 of 84 members of the 'mob.'