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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?

1. Transitions from State $A$ are ambiguously defined.
2. Transitions from State $B$ are ambiguously defined.
3. Transitions from State $C$ are ambiguously defined.
4. All of the state transitions are defined unambiguously.

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