Which of the Following Best Describes What the Following Bare

Which of the following best describes what the following Bare Bones program does? copy X to Z;
Clear X;
Incr X;
While Z not 0 do;
Clear X;
Decr Z;
End;

A) It changes the value of X to 1.
B) If the starting value of X is 0, it sets the value of X to 0. Otherwise, it sets the value of X to 1.
C) If the starting value of X is 0, it sets the value of X to 1. Otherwise, it sets the value of X to 0.
D) It ultimately leaves X the same as it was when the program started.