The state transition diagram for a finite state machine with states $A$, $B$ and $C$, and binary inputs $X$, $Y$ and $Z$, is shown in the figure.
Which one of the following statements is correct?
- Transitions from State $A$ are ambiguously defined.
- Transitions from State $B$ are ambiguously defined.
- Transitions from State $C$ are ambiguously defined.
- All of the state transitions are defined unambiguously.