List of top Communication Systems Questions on State Transition Probabilities

A state transition diagram with states $A$, $B$, and $C$, and transition probabilities $p_1, p_2, \ldots, p_7$ is shown in the figure (e.g., $p_1$ denotes the probability of transition from state $A$ to $B$). For this state diagram, select the statement(s) which is/are universally true.