Expected value is
a. ​(Probability of state A+Value in state A) (Probability of state B+Value in state B)
b. ​(Probability of state A*Value in state A)-(Probability of state B*Value in state B)
c. ​(Probability of state A*Value in state A)+(Probability of state B*Value in state B)
d. ​(Probability of state A-Value in state A) (Probability of state B-Value in state B)