Which of the following represents the transition matrix of this Markov chain?
a) [[0.7, 0.3], [0.4, 0.6]]
b) [[0.6, 0.4], [0.3, 0.7]]
c) [[0.8, 0.2], [0.5, 0.5]]
d) [[0.2, 0.8], [0.6, 0.4]]