The diagrams below show three Markov chains, where arrows indicate non-zero transition probability.
A
Markov Chain 1
State
State 2
State 3
B
Markov Chain 2
State 1
State 2
State 3
State 4
Markov Chain 3
State
State 2
State whether each of the chains is: irreducible periodic, giving the period.
[3]