Which of the Following Is Not True About Bool Values

Multiple Choice

Which of the following is not true about bool values and how they are output with the output stream?

A) The old style of representing true/false values used -1 to indicate false and 1 to indicate true.
B) A bool value outputs as 0 or 1 by default.
C) Stream manipulator boolalpha sets the output stream to display bool values as the strings "true" and "false".
D) Both boolalpha and noboolalpha are "sticky" settings.